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diff --git a/user_guide/general/common_functions.html b/user_guide/general/common_functions.html deleted file mode 100644 index 6384c17fb..000000000 --- a/user_guide/general/common_functions.html +++ /dev/null @@ -1,777 +0,0 @@ - - -<!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>Common Functions — CodeIgniter 3.1.5 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="top" title="CodeIgniter 3.1.5 documentation" 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class="reference internal" href="helpers.html">Helpers</a></li> -<li class="toctree-l2"><a class="reference internal" href="libraries.html">Using CodeIgniter Libraries</a></li> -<li class="toctree-l2"><a class="reference internal" href="creating_libraries.html">Creating Libraries</a></li> -<li class="toctree-l2"><a class="reference internal" href="drivers.html">Using CodeIgniter Drivers</a></li> -<li class="toctree-l2"><a class="reference internal" href="creating_drivers.html">Creating Drivers</a></li> -<li class="toctree-l2"><a class="reference internal" href="core_classes.html">Creating Core System Classes</a></li> -<li class="toctree-l2"><a class="reference internal" href="ancillary_classes.html">Creating Ancillary Classes</a></li> -<li class="toctree-l2"><a class="reference internal" href="hooks.html">Hooks - Extending the Framework Core</a></li> -<li class="toctree-l2"><a class="reference internal" href="autoloader.html">Auto-loading Resources</a></li> -<li class="toctree-l2 current"><a class="current reference internal" href="">Common Functions</a></li> -<li class="toctree-l2"><a class="reference internal" href="compatibility_functions.html">Compatibility Functions</a></li> -<li class="toctree-l2"><a class="reference internal" href="routing.html">URI Routing</a></li> -<li class="toctree-l2"><a class="reference internal" href="errors.html">Error Handling</a></li> -<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching</a></li> -<li class="toctree-l2"><a class="reference internal" href="profiling.html">Profiling Your Application</a></li> -<li class="toctree-l2"><a class="reference internal" href="cli.html">Running via the CLI</a></li> -<li class="toctree-l2"><a class="reference internal" href="managing_apps.html">Managing your Applications</a></li> -<li class="toctree-l2"><a class="reference internal" href="environments.html">Handling Multiple Environments</a></li> -<li class="toctree-l2"><a class="reference internal" href="alternative_php.html">Alternate PHP Syntax for View Files</a></li> -<li class="toctree-l2"><a class="reference internal" href="security.html">Security</a></li> -<li class="toctree-l2"><a class="reference internal" href="styleguide.html">PHP Style Guide</a></li> -</ul> -</li> -</ul> -<ul> -<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul> -<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li> 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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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href="../database/metadata.html">Getting MetaData</a></li> -<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li> -<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li> -<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li> -<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li> -<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li> -</ul> -</li> -</ul> -<ul> -<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul> -<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li> -<li class="toctree-l2"><a class="reference internal" 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class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li> -<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography 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>Common Functions</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="common-functions"> -<h1>Common Functions<a class="headerlink" href="#common-functions" title="Permalink to this headline">¶</a></h1> -<p>CodeIgniter uses a few functions for its operation that are globally -defined, and are available to you at any point. These do not require -loading any libraries or helpers.</p> -<div class="custom-index container"></div><dl class="function"> -<dt id="is_php"> -<tt class="descname">is_php</tt><big>(</big><em>$version</em><big>)</big><a class="headerlink" href="#is_php" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$version</strong> (<em>string</em>) – Version number</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the running PHP version is at least the one specified or FALSE if not</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> -</td> -</tr> -</tbody> -</table> -<p>Determines if the PHP version being used is greater than the -supplied version number.</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="nx">is_php</span><span class="p">(</span><span class="s1">'5.3'</span><span class="p">))</span> -<span class="p">{</span> - <span class="nv">$str</span> <span class="o">=</span> <span class="nb">quoted_printable_encode</span><span class="p">(</span><span class="nv">$str</span><span class="p">);</span> -<span class="p">}</span> -</pre></div> -</div> -<p>Returns boolean TRUE if the installed version of PHP is equal to or -greater than the supplied version number. Returns FALSE if the installed -version of PHP is lower than the supplied version number.</p> -</dd></dl> - -<dl class="function"> -<dt id="is_really_writable"> -<tt class="descname">is_really_writable</tt><big>(</big><em>$file</em><big>)</big><a class="headerlink" href="#is_really_writable" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$file</strong> (<em>string</em>) – File path</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the path is writable, FALSE if not</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> -</td> -</tr> -</tbody> -</table> -<p><tt class="docutils literal"><span class="pre">is_writable()</span></tt> returns TRUE on Windows servers when you really can’t -write to the file as the OS reports to PHP as FALSE only if the -read-only attribute is marked.</p> -<p>This function determines if a file is actually writable by attempting -to write to it first. Generally only recommended on platforms where -this information may be unreliable.</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="nx">is_really_writable</span><span class="p">(</span><span class="s1">'file.txt'</span><span class="p">))</span> -<span class="p">{</span> - <span class="k">echo</span> <span class="s2">"I could write to this if I wanted to"</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="s2">"File is not writable"</span><span class="p">;</span> -<span class="p">}</span> -</pre></div> -</div> -<div class="admonition note"> -<p class="first admonition-title">Note</p> -<p class="last">See also <a class="reference external" href="https://bugs.php.net/bug.php?id=54709">PHP bug #54709</a> for more info.</p> -</div> -</dd></dl> - -<dl class="function"> -<dt id="config_item"> -<tt class="descname">config_item</tt><big>(</big><em>$key</em><big>)</big><a class="headerlink" href="#config_item" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$key</strong> (<em>string</em>) – Config item key</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Configuration key value or NULL if not found</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> -</td> -</tr> -</tbody> -</table> -<p>The <a class="reference internal" href="../libraries/config.html"><em>Config Library</em></a> is the preferred way of -accessing configuration information, however <tt class="docutils literal"><span class="pre">config_item()</span></tt> can be used -to retrieve single keys. See <a class="reference internal" href="../libraries/config.html"><em>Config Library</em></a> -documentation for more information.</p> -</dd></dl> - -<dl class="function"> -<dt id="set_status_header"> -<tt class="descname">set_status_header</tt><big>(</big><em>$code</em><span class="optional">[</span>, <em>$text = ''</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#set_status_header" 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>$code</strong> (<em>int</em>) – HTTP Response status code</li> -<li><strong>$text</strong> (<em>string</em>) – A custom message to set with the status code</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>Permits you to manually set a server status header. Example:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">set_status_header</span><span class="p">(</span><span class="mi">401</span><span class="p">);</span> -<span class="c1">// Sets the header as: Unauthorized</span> -</pre></div> -</div> -<p><a class="reference external" href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">See here</a> for -a full list of headers.</p> -</dd></dl> - -<dl class="function"> -<dt id="remove_invisible_characters"> -<tt class="descname">remove_invisible_characters</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$url_encoded = TRUE</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#remove_invisible_characters" 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>$str</strong> (<em>string</em>) – Input string</li> -<li><strong>$url_encoded</strong> (<em>bool</em>) – Whether to remove URL-encoded characters as well</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Sanitized string</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> -</td> -</tr> -</tbody> -</table> -<p>This function prevents inserting NULL characters between ASCII -characters, like Java\0script.</p> -<p>Example:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">remove_invisible_characters</span><span class="p">(</span><span class="s1">'Java\\0script'</span><span class="p">);</span> -<span class="c1">// Returns: 'Javascript'</span> -</pre></div> -</div> -</dd></dl> - -<dl class="function"> -<dt id="html_escape"> -<tt class="descname">html_escape</tt><big>(</big><em>$var</em><big>)</big><a class="headerlink" href="#html_escape" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$var</strong> (<em>mixed</em>) – Variable to escape (string or array)</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">HTML escaped string(s)</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> -</td> -</tr> -</tbody> -</table> -<p>This function acts as an alias for PHP’s native <tt class="docutils literal"><span class="pre">htmlspecialchars()</span></tt> -function, with the advantage of being able to accept an array of strings.</p> -<p>It is useful in preventing Cross Site Scripting (XSS).</p> -</dd></dl> - -<dl class="function"> -<dt id="get_mimes"> -<tt class="descname">get_mimes</tt><big>(</big><big>)</big><a class="headerlink" href="#get_mimes" 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">An associative array of file types</td> -</tr> -<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td> -</tr> -</tbody> -</table> -<p>This function returns a <em>reference</em> to the MIMEs array from -<em>application/config/mimes.php</em>.</p> -</dd></dl> - -<dl class="function"> -<dt id="is_https"> -<tt class="descname">is_https</tt><big>(</big><big>)</big><a class="headerlink" href="#is_https" 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 if currently using HTTP-over-SSL, FALSE if not</td> -</tr> -<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> -</tr> -</tbody> -</table> -<p>Returns TRUE if a secure (HTTPS) connection is used and FALSE -in any other case (including non-HTTP requests).</p> -</dd></dl> - -<dl class="function"> -<dt id="is_cli"> -<tt class="descname">is_cli</tt><big>(</big><big>)</big><a class="headerlink" href="#is_cli" 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 if currently running under CLI, FALSE otherwise</td> -</tr> -<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td> -</tr> -</tbody> -</table> -<p>Returns TRUE if the application is run through the command line -and FALSE if not.</p> -<div class="admonition note"> -<p class="first admonition-title">Note</p> -<p class="last">This function checks both if the <tt class="docutils literal"><span class="pre">PHP_SAPI</span></tt> value is ‘cli’ -or if the <tt class="docutils literal"><span class="pre">STDIN</span></tt> constant is defined.</p> -</div> -</dd></dl> - -<dl class="function"> -<dt id="function_usable"> -<tt class="descname">function_usable</tt><big>(</big><em>$function_name</em><big>)</big><a class="headerlink" href="#function_usable" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$function_name</strong> (<em>string</em>) – Function name</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the function can be used, FALSE if not</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> -</td> -</tr> -</tbody> -</table> -<p>Returns TRUE if a function exists and is usable, FALSE otherwise.</p> -<p>This function runs a <tt class="docutils literal"><span class="pre">function_exists()</span></tt> check and if the -<cite>Suhosin extension <http://www.hardened-php.net/suhosin/></cite> is loaded, -checks if it doesn’t disable the function being checked.</p> -<p>It is useful if you want to check for the availability of functions -such as <tt class="docutils literal"><span class="pre">eval()</span></tt> and <tt class="docutils literal"><span class="pre">exec()</span></tt>, which are dangerous and might be -disabled on servers with highly restrictive security policies.</p> -<div class="admonition note"> -<p class="first admonition-title">Note</p> -<p class="last">This function was introduced because Suhosin terminated -script execution, but this turned out to be a bug. A fix -has been available for some time (version 0.9.34), but is -unfortunately not released yet.</p> -</div> -</dd></dl> - -</div> - - - </div> - <footer> - - <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> - - <a href="compatibility_functions.html" class="btn btn-neutral float-right" title="Compatibility Functions">Next <span class="fa fa-arrow-circle-right"></span></a> - - - <a href="autoloader.html" class="btn btn-neutral" title="Auto-loading Resources"><span class="fa fa-arrow-circle-left"></span> Previous</a> - - </div> - - - <hr/> - - <div role="contentinfo"> - <p> - © Copyright 2014 - 2017, British Columbia Institute of Technology. - Last updated on Jun 19, 2017. - </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:'3.1.5', - 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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