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diff --git a/user_guide/general/errors.html b/user_guide/general/errors.html new file mode 100644 index 000000000..4f9c6b398 --- /dev/null +++ b/user_guide/general/errors.html @@ -0,0 +1,649 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>Error Handling — CodeIgniter 3.1.8 documentation</title> + + + + + <link rel="shortcut icon" href="../_static/ci-icon.ico"/> + + + + <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> + + + + + + + + + + <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> + + + + <link rel="index" title="Index" + href="../genindex.html"/> + <link rel="search" title="Search" 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Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li> +<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul> +<li class="toctree-l2"><a 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Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> +<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> +</ul> +</li> +</ul> + + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">CodeIgniter</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="index.html">General Topics</a> »</li> + + <li>Error Handling</li> + <li class="wy-breadcrumbs-aside"> + + </li> + <div style="float:right;margin-left:5px;" id="closeMe"> + <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> + </div> + </ul> + <hr/> +</div> + <div role="main" class="document"> + + <div class="section" id="error-handling"> +<h1>Error Handling<a class="headerlink" href="#error-handling" title="Permalink to this headline">¶</a></h1> +<p>CodeIgniter lets you build error reporting into your applications using +the functions described below. In addition, it has an error logging +class that permits error and debugging messages to be saved as text +files.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">By default, CodeIgniter displays all PHP errors. You might +wish to change this behavior once your development is complete. You’ll +find the error_reporting() function located at the top of your main +index.php file. Disabling error reporting will NOT prevent log files +from being written if there are errors.</p> +</div> +<p>Unlike most systems in CodeIgniter, the error functions are simple +procedural interfaces that are available globally throughout the +application. This approach permits error messages to get triggered +without having to worry about class/function scoping.</p> +<p>CodeIgniter also returns a status code whenever a portion of the core +calls <code class="docutils literal"><span class="pre">exit()</span></code>. This exit status code is separate from the HTTP status +code, and serves as a notice to other processes that may be watching of +whether the script completed successfully, or if not, what kind of +problem it encountered that caused it to abort. These values are +defined in <em>application/config/constants.php</em>. While exit status codes +are most useful in CLI settings, returning the proper code helps server +software keep track of your scripts and the health of your application.</p> +<p>The following functions let you generate errors:</p> +<dl class="function"> +<dt id="show_error"> +<code class="descname">show_error</code><span class="sig-paren">(</span><em>$message</em>, <em>$status_code</em>, <em>$heading = 'An Error Was Encountered'</em><span class="sig-paren">)</span><a class="headerlink" href="#show_error" title="Permalink to this definition">¶</a></dt> +<dd><table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>$message</strong> (<em>mixed</em>) – Error message</li> +<li><strong>$status_code</strong> (<em>int</em>) – HTTP Response status code</li> +<li><strong>$heading</strong> (<em>string</em>) – Error page heading</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>This function will display the error message supplied to it using +the error template appropriate to your execution:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">application</span><span class="o">/</span><span class="nx">views</span><span class="o">/</span><span class="nx">errors</span><span class="o">/</span><span class="nx">html</span><span class="o">/</span><span class="nx">error_general</span><span class="o">.</span><span class="nx">php</span> +</pre></div> +</div> +<p>or:</p> +<blockquote> +<div>application/views/errors/cli/error_general.php</div></blockquote> +<p>The optional parameter <code class="docutils literal"><span class="pre">$status_code</span></code> determines what HTTP status +code should be sent with the error. If <code class="docutils literal"><span class="pre">$status_code</span></code> is less +than 100, the HTTP status code will be set to 500, and the exit +status code will be set to <code class="docutils literal"><span class="pre">$status_code</span> <span class="pre">+</span> <span class="pre">EXIT__AUTO_MIN</span></code>. +If that value is larger than <code class="docutils literal"><span class="pre">EXIT__AUTO_MAX</span></code>, or if +<code class="docutils literal"><span class="pre">$status_code</span></code> is 100 or higher, the exit status code will be set +to <code class="docutils literal"><span class="pre">EXIT_ERROR</span></code>. +You can check in <em>application/config/constants.php</em> for more detail.</p> +</dd></dl> + +<dl class="function"> +<dt id="show_404"> +<code class="descname">show_404</code><span class="sig-paren">(</span><em>$page = ''</em>, <em>$log_error = TRUE</em><span class="sig-paren">)</span><a class="headerlink" href="#show_404" 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>$page</strong> (<em>string</em>) – URI string</li> +<li><strong>$log_error</strong> (<em>bool</em>) – Whether to log the error</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>This function will display the 404 error message supplied to it +using the error template appropriate to your execution:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">application</span><span class="o">/</span><span class="nx">views</span><span class="o">/</span><span class="nx">errors</span><span class="o">/</span><span class="nx">html</span><span class="o">/</span><span class="nx">error_404</span><span class="o">.</span><span class="nx">php</span> +</pre></div> +</div> +<p>or:</p> +<blockquote> +<div>application/views/errors/cli/error_404.php</div></blockquote> +<p>The function expects the string passed to it to be the file path to +the page that isn’t found. The exit status code will be set to +<code class="docutils literal"><span class="pre">EXIT_UNKNOWN_FILE</span></code>. +Note that CodeIgniter automatically shows 404 messages if +controllers are not found.</p> +<p>CodeIgniter automatically logs any <code class="docutils literal"><span class="pre">show_404()</span></code> calls. Setting the +optional second parameter to FALSE will skip logging.</p> +</dd></dl> + +<dl class="function"> +<dt id="log_message"> +<code class="descname">log_message</code><span class="sig-paren">(</span><em>$level</em>, <em>$message</em><span class="sig-paren">)</span><a class="headerlink" href="#log_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>$level</strong> (<em>string</em>) – Log level: ‘error’, ‘debug’ or ‘info’</li> +<li><strong>$message</strong> (<em>string</em>) – Message to log</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>This function lets you write messages to your log files. You must +supply one of three “levels” in the first parameter, indicating what +type of message it is (debug, error, info), with the message itself +in the second parameter.</p> +<p>Example:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$some_var</span> <span class="o">==</span> <span class="s1">''</span><span class="p">)</span> +<span class="p">{</span> + <span class="nx">log_message</span><span class="p">(</span><span class="s1">'error'</span><span class="p">,</span> <span class="s1">'Some variable did not contain a value.'</span><span class="p">);</span> +<span class="p">}</span> +<span class="k">else</span> +<span class="p">{</span> + <span class="nx">log_message</span><span class="p">(</span><span class="s1">'debug'</span><span class="p">,</span> <span class="s1">'Some variable was correctly set'</span><span class="p">);</span> +<span class="p">}</span> + +<span class="nx">log_message</span><span class="p">(</span><span class="s1">'info'</span><span class="p">,</span> <span class="s1">'The purpose of some variable is to provide some value.'</span><span class="p">);</span> +</pre></div> +</div> +<p>There are three message types:</p> +<ol class="arabic simple"> +<li>Error Messages. These are actual errors, such as PHP errors or +user errors.</li> +<li>Debug Messages. These are messages that assist in debugging. For +example, if a class has been initialized, you could log this as +debugging info.</li> +<li>Informational Messages. These are the lowest priority messages, +simply giving information regarding some process.</li> +</ol> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In order for the log file to actually be written, the +<em>logs/</em> directory must be writable. In addition, you must +set the “threshold” for logging in +<em>application/config/config.php</em>. You might, for example, +only want error messages to be logged, and not the other +two types. If you set it to zero logging will be disabled.</p> +</div> +</dd></dl> + +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="caching.html" class="btn btn-neutral float-right" title="Web Page Caching">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="routing.html" class="btn btn-neutral" title="URI Routing"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2018, British Columbia Institute of Technology. + Last updated on Mar 22, 2018. + </p> + </div> + + Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. + +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'3.1.8', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: false + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html>
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