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- <div class="section" id="xml-rpc-and-xml-rpc-server-classes">
-<h1>XML-RPC and XML-RPC Server Classes<a class="headerlink" href="#xml-rpc-and-xml-rpc-server-classes" title="Permalink to this headline">¶</a></h1>
-<p>CodeIgniter&#8217;s XML-RPC classes permit you to send requests to another
-server, or set up your own XML-RPC server to receive requests.</p>
-<div class="contents local topic" id="contents">
-<ul class="simple">
-<li><a class="reference internal" href="#what-is-xml-rpc" id="id3">What is XML-RPC?</a></li>
-<li><a class="reference internal" href="#using-the-xml-rpc-class" id="id4">Using the XML-RPC Class</a><ul>
-<li><a class="reference internal" href="#initializing-the-class" id="id5">Initializing the Class</a></li>
-<li><a class="reference internal" href="#sending-xml-rpc-requests" id="id6">Sending XML-RPC Requests</a><ul>
-<li><a class="reference internal" href="#explanation" id="id7">Explanation</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#anatomy-of-a-request" id="id8">Anatomy of a Request</a></li>
-<li><a class="reference internal" href="#creating-an-xml-rpc-server" id="id9">Creating an XML-RPC Server</a></li>
-<li><a class="reference internal" href="#processing-server-requests" id="id10">Processing Server Requests</a><ul>
-<li><a class="reference internal" href="#notes" id="id11">Notes:</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#formatting-a-response" id="id12">Formatting a Response</a></li>
-<li><a class="reference internal" href="#sending-an-error-response" id="id13">Sending an Error Response</a></li>
-<li><a class="reference internal" href="#creating-your-own-client-and-server" id="id14">Creating Your Own Client and Server</a><ul>
-<li><a class="reference internal" href="#the-client" id="id15">The Client</a></li>
-<li><a class="reference internal" href="#the-server" id="id16">The Server</a></li>
-<li><a class="reference internal" href="#try-it" id="id17">Try it!</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#using-associative-arrays-in-a-request-parameter" id="id18">Using Associative Arrays In a Request Parameter</a></li>
-<li><a class="reference internal" href="#id2" id="id19">Data Types</a></li>
-</ul>
-</li>
-<li><a class="reference internal" href="#class-reference" id="id20">Class Reference</a></li>
-</ul>
-</div>
-<div class="custom-index container"></div><div class="section" id="what-is-xml-rpc">
-<h2><a class="toc-backref" href="#id3">What is XML-RPC?</a><a class="headerlink" href="#what-is-xml-rpc" title="Permalink to this headline">¶</a></h2>
-<p>Quite simply it is a way for two computers to communicate over the
-internet using XML. One computer, which we will call the client, sends
-an XML-RPC <strong>request</strong> to another computer, which we will call the
-server. Once the server receives and processes the request it will send
-back a <strong>response</strong> to the client.</p>
-<p>For example, using the MetaWeblog API, an XML-RPC Client (usually a
-desktop publishing tool) will send a request to an XML-RPC Server
-running on your site. This request might be a new weblog entry being
-sent for publication, or it could be a request for an existing entry for
-editing. When the XML-RPC Server receives this request it will examine
-it to determine which class/method should be called to process the
-request. Once processed, the server will then send back a response
-message.</p>
-<p>For detailed specifications, you can visit the <a class="reference external" href="http://www.xmlrpc.com/">XML-RPC</a> site.</p>
-</div>
-<div class="section" id="using-the-xml-rpc-class">
-<h2><a class="toc-backref" href="#id4">Using the XML-RPC Class</a><a class="headerlink" href="#using-the-xml-rpc-class" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="initializing-the-class">
-<h3><a class="toc-backref" href="#id5">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3>
-<p>Like most other classes in CodeIgniter, the XML-RPC and XML-RPCS classes
-are initialized in your controller using the $this-&gt;load-&gt;library
-function:</p>
-<p>To load the XML-RPC class you will use:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Once loaded, the xml-rpc library object will be available using:
-$this-&gt;xmlrpc</p>
-<p>To load the XML-RPC Server class you will use:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpcs&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Once loaded, the xml-rpcs library object will be available using:
-$this-&gt;xmlrpcs</p>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">When using the XML-RPC Server class you must load BOTH the
-XML-RPC class and the XML-RPC Server class.</p>
-</div>
-</div>
-<div class="section" id="sending-xml-rpc-requests">
-<h3><a class="toc-backref" href="#id6">Sending XML-RPC Requests</a><a class="headerlink" href="#sending-xml-rpc-requests" title="Permalink to this headline">¶</a></h3>
-<p>To send a request to an XML-RPC server you must specify the following
-information:</p>
-<ul class="simple">
-<li>The URL of the server</li>
-<li>The method on the server you wish to call</li>
-<li>The <em>request</em> data (explained below).</li>
-</ul>
-<p>Here is a basic example that sends a simple Weblogs.com ping to the
-<a class="reference external" href="http://pingomatic.com/">Ping-o-Matic</a></p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="s1">&#39;http://rpc.pingomatic.com/&#39;</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">method</span><span class="p">(</span><span class="s1">&#39;weblogUpdates.ping&#39;</span><span class="p">);</span>
-
-<span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;My Photoblog&#39;</span><span class="p">,</span> <span class="s1">&#39;http://www.my-site.com/photoblog/&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
-
-<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_request</span><span class="p">())</span>
-<span class="p">{</span>
- <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_error</span><span class="p">();</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-<div class="section" id="explanation">
-<h4><a class="toc-backref" href="#id7">Explanation</a><a class="headerlink" href="#explanation" title="Permalink to this headline">¶</a></h4>
-<p>The above code initializes the XML-RPC class, sets the server URL and
-method to be called (weblogUpdates.ping). The request (in this case, the
-title and URL of your site) is placed into an array for transportation,
-and compiled using the request() function. Lastly, the full request is
-sent. If the send_request() method returns false we will display the
-error message sent back from the XML-RPC Server.</p>
-</div>
-</div>
-<div class="section" id="anatomy-of-a-request">
-<h3><a class="toc-backref" href="#id8">Anatomy of a Request</a><a class="headerlink" href="#anatomy-of-a-request" title="Permalink to this headline">¶</a></h3>
-<p>An XML-RPC request is simply the data you are sending to the XML-RPC
-server. Each piece of data in a request is referred to as a request
-parameter. The above example has two parameters: The URL and title of
-your site. When the XML-RPC server receives your request, it will look
-for parameters it requires.</p>
-<p>Request parameters must be placed into an array for transportation, and
-each parameter can be one of seven data types (strings, numbers, dates,
-etc.). If your parameters are something other than strings you will have
-to include the data type in the request array.</p>
-<p>Here is an example of a simple array with three parameters:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;Doe&#39;</span><span class="p">,</span> <span class="s1">&#39;www.some-site.com&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>If you use data types other than strings, or if you have several
-different data types, you will place each parameter into its own array,
-with the data type in the second position:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
- <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Doe&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="k">array</span><span class="p">(</span><span class="k">FALSE</span><span class="p">,</span> <span class="s1">&#39;boolean&#39;</span><span class="p">),</span>
- <span class="k">array</span><span class="p">(</span><span class="mi">12345</span><span class="p">,</span> <span class="s1">&#39;int&#39;</span><span class="p">)</span>
-<span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>The <a class="reference external" href="#datatypes">Data Types</a> section below has a full list of data
-types.</p>
-</div>
-<div class="section" id="creating-an-xml-rpc-server">
-<h3><a class="toc-backref" href="#id9">Creating an XML-RPC Server</a><a class="headerlink" href="#creating-an-xml-rpc-server" title="Permalink to this headline">¶</a></h3>
-<p>An XML-RPC Server acts as a traffic cop of sorts, waiting for incoming
-requests and redirecting them to the appropriate functions for
-processing.</p>
-<p>To create your own XML-RPC server involves initializing the XML-RPC
-Server class in your controller where you expect the incoming request to
-appear, then setting up an array with mapping instructions so that
-incoming requests can be sent to the appropriate class and method for
-processing.</p>
-<p>Here is an example to illustrate:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpcs&#39;</span><span class="p">);</span>
-
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;functions&#39;</span><span class="p">][</span><span class="s1">&#39;new_post&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;My_blog.new_entry&#39;</span><span class="p">);</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;functions&#39;</span><span class="p">][</span><span class="s1">&#39;update_post&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;My_blog.update_entry&#39;</span><span class="p">);</span>
-<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;object&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="nv">$this</span><span class="p">;</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">serve</span><span class="p">();</span>
-</pre></div>
-</div>
-<p>The above example contains an array specifying two method requests that
-the Server allows. The allowed methods are on the left side of the
-array. When either of those are received, they will be mapped to the
-class and method on the right.</p>
-<p>The &#8216;object&#8217; key is a special key that you pass an instantiated class
-object with, which is necessary when the method you are mapping to is
-not part of the CodeIgniter super object.</p>
-<p>In other words, if an XML-RPC Client sends a request for the new_post
-method, your server will load the My_blog class and call the new_entry
-function. If the request is for the update_post method, your server
-will load the My_blog class and call the <tt class="docutils literal"><span class="pre">update_entry()</span></tt> method.</p>
-<p>The function names in the above example are arbitrary. You&#8217;ll decide
-what they should be called on your server, or if you are using
-standardized APIs, like the Blogger or MetaWeblog API, you&#8217;ll use their
-function names.</p>
-<p>There are two additional configuration keys you may make use of when
-initializing the server class: debug can be set to TRUE in order to
-enable debugging, and xss_clean may be set to FALSE to prevent sending
-data through the Security library&#8217;s <tt class="docutils literal"><span class="pre">xss_clean()</span></tt> method.</p>
-</div>
-<div class="section" id="processing-server-requests">
-<h3><a class="toc-backref" href="#id10">Processing Server Requests</a><a class="headerlink" href="#processing-server-requests" title="Permalink to this headline">¶</a></h3>
-<p>When the XML-RPC Server receives a request and loads the class/method
-for processing, it will pass an object to that method containing the
-data sent by the client.</p>
-<p>Using the above example, if the new_post method is requested, the
-server will expect a class to exist with this prototype:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">My_blog</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">new_post</span><span class="p">(</span><span class="nv">$request</span><span class="p">)</span>
- <span class="p">{</span>
-
- <span class="p">}</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-<p>The $request variable is an object compiled by the Server, which
-contains the data sent by the XML-RPC Client. Using this object you will
-have access to the <em>request parameters</em> enabling you to process the
-request. When you are done you will send a Response back to the Client.</p>
-<p>Below is a real-world example, using the Blogger API. One of the methods
-in the Blogger API is <tt class="docutils literal"><span class="pre">getUserInfo()</span></tt>. Using this method, an XML-RPC
-Client can send the Server a username and password, in return the Server
-sends back information about that particular user (nickname, user ID,
-email address, etc.). Here is how the processing function might look:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">My_blog</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">getUserInfo</span><span class="p">(</span><span class="nv">$request</span><span class="p">)</span>
- <span class="p">{</span>
- <span class="nv">$username</span> <span class="o">=</span> <span class="s1">&#39;smitty&#39;</span><span class="p">;</span>
- <span class="nv">$password</span> <span class="o">=</span> <span class="s1">&#39;secretsmittypass&#39;</span><span class="p">;</span>
-
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
-
- <span class="nv">$parameters</span> <span class="o">=</span> <span class="nv">$request</span><span class="o">-&gt;</span><span class="na">output_parameters</span><span class="p">();</span>
-
- <span class="k">if</span> <span class="p">(</span><span class="nv">$parameters</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">!=</span> <span class="nv">$username</span> <span class="o">&amp;&amp;</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="o">!=</span> <span class="nv">$password</span><span class="p">)</span>
- <span class="p">{</span>
- <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_error_message</span><span class="p">(</span><span class="s1">&#39;100&#39;</span><span class="p">,</span> <span class="s1">&#39;Invalid Access&#39;</span><span class="p">);</span>
- <span class="p">}</span>
-
- <span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
- <span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;nickname&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Smitty&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="s1">&#39;userid&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;99&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="s1">&#39;url&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;http://yoursite.com&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="s1">&#39;email&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;jsmith@yoursite.com&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="s1">&#39;lastname&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Smith&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="s1">&#39;firstname&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">)</span>
- <span class="p">),</span>
- <span class="s1">&#39;struct&#39;</span>
- <span class="p">);</span>
-
- <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_response</span><span class="p">(</span><span class="nv">$response</span><span class="p">);</span>
- <span class="p">}</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-<div class="section" id="notes">
-<h4><a class="toc-backref" href="#id11">Notes:</a><a class="headerlink" href="#notes" title="Permalink to this headline">¶</a></h4>
-<p>The <tt class="docutils literal"><span class="pre">output_parameters()</span></tt> method retrieves an indexed array
-corresponding to the request parameters sent by the client. In the above
-example, the output parameters will be the username and password.</p>
-<p>If the username and password sent by the client were not valid, and
-error message is returned using <tt class="docutils literal"><span class="pre">send_error_message()</span></tt>.</p>
-<p>If the operation was successful, the client will be sent back a response
-array containing the user&#8217;s info.</p>
-</div>
-</div>
-<div class="section" id="formatting-a-response">
-<h3><a class="toc-backref" href="#id12">Formatting a Response</a><a class="headerlink" href="#formatting-a-response" title="Permalink to this headline">¶</a></h3>
-<p>Similar to <em>Requests</em>, <em>Responses</em> must be formatted as an array.
-However, unlike requests, a response is an array <strong>that contains a
-single item</strong>. This item can be an array with several additional arrays,
-but there can be only one primary array index. In other words, the basic
-prototype is this:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Response data&#39;</span><span class="p">,</span> <span class="s1">&#39;array&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Responses, however, usually contain multiple pieces of information. In
-order to accomplish this we must put the response into its own array so
-that the primary array continues to contain a single piece of data.
-Here&#8217;s an example showing how this might be accomplished:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
- <span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;first_name&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;John&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="s1">&#39;last_name&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;Doe&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span>
- <span class="s1">&#39;member_id&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="mi">123435</span><span class="p">,</span> <span class="s1">&#39;int&#39;</span><span class="p">),</span>
- <span class="s1">&#39;todo_list&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;clean house&#39;</span><span class="p">,</span> <span class="s1">&#39;call mom&#39;</span><span class="p">,</span> <span class="s1">&#39;water plants&#39;</span><span class="p">),</span> <span class="s1">&#39;array&#39;</span><span class="p">),</span>
- <span class="p">),</span>
- <span class="s1">&#39;struct&#39;</span>
-<span class="p">);</span>
-</pre></div>
-</div>
-<p>Notice that the above array is formatted as a struct. This is the most
-common data type for responses.</p>
-<p>As with Requests, a response can be one of the seven data types listed
-in the <a class="reference external" href="#datatypes">Data Types</a> section.</p>
-</div>
-<div class="section" id="sending-an-error-response">
-<h3><a class="toc-backref" href="#id13">Sending an Error Response</a><a class="headerlink" href="#sending-an-error-response" title="Permalink to this headline">¶</a></h3>
-<p>If you need to send the client an error response you will use the
-following:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_error_message</span><span class="p">(</span><span class="s1">&#39;123&#39;</span><span class="p">,</span> <span class="s1">&#39;Requested data not available&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>The first parameter is the error number while the second parameter is
-the error message.</p>
-</div>
-<div class="section" id="creating-your-own-client-and-server">
-<h3><a class="toc-backref" href="#id14">Creating Your Own Client and Server</a><a class="headerlink" href="#creating-your-own-client-and-server" title="Permalink to this headline">¶</a></h3>
-<p>To help you understand everything we&#8217;ve covered thus far, let&#8217;s create a
-couple controllers that act as XML-RPC Client and Server. You&#8217;ll use the
-Client to send a request to the Server and receive a response.</p>
-<div class="section" id="the-client">
-<h4><a class="toc-backref" href="#id15">The Client</a><a class="headerlink" href="#the-client" title="Permalink to this headline">¶</a></h4>
-<p>Using a text editor, create a controller called Xmlrpc_client.php. In
-it, place this code and save it to your application/controllers/
-folder:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
-
-<span class="k">class</span> <span class="nc">Xmlrpc_client</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
- <span class="p">{</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
- <span class="nv">$server_url</span> <span class="o">=</span> <span class="nx">site_url</span><span class="p">(</span><span class="s1">&#39;xmlrpc_server&#39;</span><span class="p">);</span>
-
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
-
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="nv">$server_url</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">method</span><span class="p">(</span><span class="s1">&#39;Greetings&#39;</span><span class="p">);</span>
-
- <span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;How is it going?&#39;</span><span class="p">);</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
-
- <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_request</span><span class="p">())</span>
- <span class="p">{</span>
- <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_error</span><span class="p">();</span>
- <span class="p">}</span>
- <span class="k">else</span>
- <span class="p">{</span>
- <span class="k">echo</span> <span class="s1">&#39;&lt;pre&gt;&#39;</span><span class="p">;</span>
- <span class="nb">print_r</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_response</span><span class="p">());</span>
- <span class="k">echo</span> <span class="s1">&#39;&lt;/pre&gt;&#39;</span><span class="p">;</span>
- <span class="p">}</span>
- <span class="p">}</span>
-<span class="p">}</span>
-<span class="cp">?&gt;</span>
-</pre></div>
-</div>
-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">In the above code we are using a &#8220;url helper&#8221;. You can find more
-information in the <a class="reference internal" href="../general/helpers.html"><em>Helpers Functions</em></a> page.</p>
-</div>
-</div>
-<div class="section" id="the-server">
-<h4><a class="toc-backref" href="#id16">The Server</a><a class="headerlink" href="#the-server" title="Permalink to this headline">¶</a></h4>
-<p>Using a text editor, create a controller called Xmlrpc_server.php. In
-it, place this code and save it to your application/controllers/
-folder:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
-
-<span class="k">class</span> <span class="nc">Xmlrpc_server</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
- <span class="p">{</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpc&#39;</span><span class="p">);</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;xmlrpcs&#39;</span><span class="p">);</span>
-
- <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;functions&#39;</span><span class="p">][</span><span class="s1">&#39;Greetings&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Xmlrpc_server.process&#39;</span><span class="p">);</span>
-
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpcs</span><span class="o">-&gt;</span><span class="na">serve</span><span class="p">();</span>
- <span class="p">}</span>
-
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">process</span><span class="p">(</span><span class="nv">$request</span><span class="p">)</span>
- <span class="p">{</span>
- <span class="nv">$parameters</span> <span class="o">=</span> <span class="nv">$request</span><span class="o">-&gt;</span><span class="na">output_parameters</span><span class="p">();</span>
-
- <span class="nv">$response</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
- <span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;you_said&#39;</span> <span class="o">=&gt;</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span>
- <span class="s1">&#39;i_respond&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Not bad at all.&#39;</span>
- <span class="p">),</span>
- <span class="s1">&#39;struct&#39;</span>
- <span class="p">);</span>
-
- <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_response</span><span class="p">(</span><span class="nv">$response</span><span class="p">);</span>
- <span class="p">}</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="try-it">
-<h4><a class="toc-backref" href="#id17">Try it!</a><a class="headerlink" href="#try-it" title="Permalink to this headline">¶</a></h4>
-<p>Now visit the your site using a URL similar to this:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">xmlrpc_client</span><span class="o">/</span>
-</pre></div>
-</div>
-<p>You should now see the message you sent to the server, and its response
-back to you.</p>
-<p>The client you created sends a message (&#8220;How&#8217;s is going?&#8221;) to the
-server, along with a request for the &#8220;Greetings&#8221; method. The Server
-receives the request and maps it to the <tt class="docutils literal"><span class="pre">process()</span></tt> method, where a
-response is sent back.</p>
-</div>
-</div>
-<div class="section" id="using-associative-arrays-in-a-request-parameter">
-<h3><a class="toc-backref" href="#id18">Using Associative Arrays In a Request Parameter</a><a class="headerlink" href="#using-associative-arrays-in-a-request-parameter" title="Permalink to this headline">¶</a></h3>
-<p>If you wish to use an associative array in your method parameters you
-will need to use a struct datatype:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
- <span class="k">array</span><span class="p">(</span>
- <span class="c1">// Param 0</span>
- <span class="k">array</span><span class="p">(</span><span class="s1">&#39;name&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;John&#39;</span><span class="p">),</span>
- <span class="s1">&#39;struct&#39;</span>
- <span class="p">),</span>
- <span class="k">array</span><span class="p">(</span>
- <span class="c1">// Param 1</span>
- <span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;size&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;large&#39;</span><span class="p">,</span>
- <span class="s1">&#39;shape&#39;</span><span class="o">=&gt;</span><span class="s1">&#39;round&#39;</span>
- <span class="p">),</span>
- <span class="s1">&#39;struct&#39;</span>
- <span class="p">)</span>
-<span class="p">);</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>You can retrieve the associative array when processing the request in
-the Server.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$parameters</span> <span class="o">=</span> <span class="nv">$request</span><span class="o">-&gt;</span><span class="na">output_parameters</span><span class="p">();</span>
-<span class="nv">$name</span> <span class="o">=</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="s1">&#39;name&#39;</span><span class="p">];</span>
-<span class="nv">$size</span> <span class="o">=</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">1</span><span class="p">][</span><span class="s1">&#39;size&#39;</span><span class="p">];</span>
-<span class="nv">$shape</span> <span class="o">=</span> <span class="nv">$parameters</span><span class="p">[</span><span class="mi">1</span><span class="p">][</span><span class="s1">&#39;shape&#39;</span><span class="p">];</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="id2">
-<h3><a class="toc-backref" href="#id19">Data Types</a><a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
-<p>According to the <a class="reference external" href="http://www.xmlrpc.com/spec">XML-RPC spec</a> there are
-seven types of values that you can send via XML-RPC:</p>
-<ul class="simple">
-<li><em>int</em> or <em>i4</em></li>
-<li><em>boolean</em></li>
-<li><em>string</em></li>
-<li><em>double</em></li>
-<li><em>dateTime.iso8601</em></li>
-<li><em>base64</em></li>
-<li><em>struct</em> (contains array of values)</li>
-<li><em>array</em> (contains array of values)</li>
-</ul>
-</div>
-</div>
-<div class="section" id="class-reference">
-<h2><a class="toc-backref" href="#id20">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
-<dl class="class">
-<dt id="CI_Xmlrpc">
-<em class="property">class </em><tt class="descname">CI_Xmlrpc</tt><a class="headerlink" href="#CI_Xmlrpc" title="Permalink to this definition">¶</a></dt>
-<dd><dl class="method">
-<dt id="CI_Xmlrpc::initialize">
-<tt class="descname">initialize</tt><big>(</big><span class="optional">[</span><em>$config = array()</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Xmlrpc::initialize" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$config</strong> (<em>array</em>) &#8211; Configuration data</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Initializes the XML-RPC library. Accepts an associative array containing your settings.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::server">
-<tt class="descname">server</tt><big>(</big><em>$url</em><span class="optional">[</span>, <em>$port = 80</em><span class="optional">[</span>, <em>$proxy = FALSE</em><span class="optional">[</span>, <em>$proxy_port = 8080</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Xmlrpc::server" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$url</strong> (<em>string</em>) &#8211; XML-RPC server URL</li>
-<li><strong>$port</strong> (<em>int</em>) &#8211; Server port</li>
-<li><strong>$proxy</strong> (<em>string</em>) &#8211; Optional proxy</li>
-<li><strong>$proxy_port</strong> (<em>int</em>) &#8211; Proxy listening port</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Sets the URL and port number of the server to which a request is to be sent:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="s1">&#39;http://www.sometimes.com/pings.php&#39;</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Basic HTTP authentication is also supported, simply add it to the server URL:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">server</span><span class="p">(</span><span class="s1">&#39;http://user:pass@localhost/&#39;</span><span class="p">,</span> <span class="mi">80</span><span class="p">);</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::timeout">
-<tt class="descname">timeout</tt><big>(</big><em>$seconds = 5</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::timeout" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$seconds</strong> (<em>int</em>) &#8211; Timeout in seconds</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Set a time out period (in seconds) after which the request will be canceled:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">timeout</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>This timeout period will be used both for an initial connection to
-the remote server, as well as for getting a response from it.
-Make sure you set the timeout before calling <tt class="docutils literal"><span class="pre">send_request()</span></tt>.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::method">
-<tt class="descname">method</tt><big>(</big><em>$function</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::method" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$function</strong> (<em>string</em>) &#8211; Method name</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Sets the method that will be requested from the XML-RPC server:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">method</span><span class="p">(</span><span class="s1">&#39;method&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-<p>Where method is the name of the method.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::request">
-<tt class="descname">request</tt><big>(</big><em>$incoming</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::request" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$incoming</strong> (<em>array</em>) &#8211; Request data</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Takes an array of data and builds request to be sent to XML-RPC server:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$request</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;My Photoblog&#39;</span><span class="p">,</span> <span class="s1">&#39;string&#39;</span><span class="p">),</span> <span class="s1">&#39;http://www.yoursite.com/photoblog/&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">request</span><span class="p">(</span><span class="nv">$request</span><span class="p">);</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::send_request">
-<tt class="descname">send_request</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Xmlrpc::send_request" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
-</tr>
-</tbody>
-</table>
-<p>The request sending method. Returns boolean TRUE or FALSE based on success for failure, enabling it to be used conditionally.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::display_error">
-<tt class="descname">display_error</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Xmlrpc::display_error" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Error message string</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
-</tr>
-</tbody>
-</table>
-<p>Returns an error message as a string if your request failed for some reason.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_error</span><span class="p">();</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::display_response">
-<tt class="descname">display_response</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Xmlrpc::display_response" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Response</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">mixed</td>
-</tr>
-</tbody>
-</table>
-<p>Returns the response from the remote server once request is received. The response will typically be an associative array.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">display_response</span><span class="p">();</span>
-</pre></div>
-</div>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Xmlrpc::send_error_message">
-<tt class="descname">send_error_message</tt><big>(</big><em>$number</em>, <em>$message</em><big>)</big><a class="headerlink" href="#CI_Xmlrpc::send_error_message" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$number</strong> (<em>int</em>) &#8211; Error number</li>
-<li><strong>$message</strong> (<em>string</em>) &#8211; Error message</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">XML_RPC_Response instance</p>
-</td>
-</tr>
-<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">XML_RPC_Response</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>This method lets you send an error message from your server to the client.
-First parameter is the error number while the second parameter is the error message.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">xmlrpc</span><span class="o">-&gt;</span><span class="na">send_error_message</span><span class="p">(</span><span class="mi">123</span><span class="p">,</span> <span class="s1">&#39;Requested data not available&#39;</span><span class="p">);</span>
-</pre></div>
-</div>
-</dd></dl>
-
-</dd></dl>
-
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