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| <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> |
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| <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> |
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| <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> |
| <li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li> |
| </ul> |
| </li> |
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| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul> |
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| <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li> |
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| <li class="toctree-l2"><a class="reference internal" 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" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li> |
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| |
| <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"> |
| <code class="descname">is_php</code><span class="sig-paren">(</span><em>$version</em><span class="sig-paren">)</span><a class="headerlink" href="#is_php" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$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"> |
| <code class="descname">is_really_writable</code><span class="sig-paren">(</span><em>$file</em><span class="sig-paren">)</span><a class="headerlink" href="#is_really_writable" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$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><code class="docutils literal"><span class="pre">is_writable()</span></code> 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"> |
| <code class="descname">config_item</code><span class="sig-paren">(</span><em>$key</em><span class="sig-paren">)</span><a class="headerlink" href="#config_item" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$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"><span class="doc">Config Library</span></a> is the preferred way of |
| accessing configuration information, however <code class="docutils literal"><span class="pre">config_item()</span></code> can be used |
| to retrieve single keys. See <a class="reference internal" href="../libraries/config.html"><span class="doc">Config Library</span></a> |
| documentation for more information.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="set_status_header"> |
| <code class="descname">set_status_header</code><span class="sig-paren">(</span><em>$code</em><span class="optional">[</span>, <em>$text = ''</em><span class="optional">]</span><span class="sig-paren">)</span><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"> |
| <code class="descname">remove_invisible_characters</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$url_encoded = TRUE</em><span class="optional">]</span><span class="sig-paren">)</span><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"> |
| <code class="descname">html_escape</code><span class="sig-paren">(</span><em>$var</em><span class="sig-paren">)</span><a class="headerlink" href="#html_escape" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$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 <code class="docutils literal"><span class="pre">htmlspecialchars()</span></code> |
| 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"> |
| <code class="descname">get_mimes</code><span class="sig-paren">(</span><span class="sig-paren">)</span><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"> |
| <code class="descname">is_https</code><span class="sig-paren">(</span><span class="sig-paren">)</span><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"> |
| <code class="descname">is_cli</code><span class="sig-paren">(</span><span class="sig-paren">)</span><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 <code class="docutils literal"><span class="pre">PHP_SAPI</span></code> value is ‘cli’ |
| or if the <code class="docutils literal"><span class="pre">STDIN</span></code> constant is defined.</p> |
| </div> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="function_usable"> |
| <code class="descname">function_usable</code><span class="sig-paren">(</span><em>$function_name</em><span class="sig-paren">)</span><a class="headerlink" href="#function_usable" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$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 <code class="docutils literal"><span class="pre">function_exists()</span></code> 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 <code class="docutils literal"><span class="pre">eval()</span></code> and <code class="docutils literal"><span class="pre">exec()</span></code>, 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> |
| |
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