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| |
| <div class="section" id="compatibility-functions"> |
| <h1>Compatibility Functions<a class="headerlink" href="#compatibility-functions" title="Permalink to this headline">¶</a></h1> |
| <p>CodeIgniter provides a set of compatibility functions that enable |
| you to use functions what are otherwise natively available in PHP, |
| but only in higher versions or depending on a certain extension.</p> |
| <p>Being custom implementations, these functions will also have some |
| set of dependencies on their own, but are still useful if your |
| PHP setup doesn’t offer them natively.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Much like the <a class="reference internal" href="common_functions.html"><span class="doc">common functions</span></a>, the |
| compatibility functions are always available, as long as |
| their dependencies are met.</p> |
| </div> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><a class="reference internal" href="#password-hashing" id="id7">Password Hashing</a><ul> |
| <li><a class="reference internal" href="#dependencies" id="id8">Dependencies</a></li> |
| <li><a class="reference internal" href="#constants" id="id9">Constants</a></li> |
| <li><a class="reference internal" href="#function-reference" id="id10">Function reference</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#hash-message-digest" id="id11">Hash (Message Digest)</a><ul> |
| <li><a class="reference internal" href="#id1" id="id12">Dependencies</a></li> |
| <li><a class="reference internal" href="#id2" id="id13">Function reference</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#multibyte-string" id="id14">Multibyte String</a><ul> |
| <li><a class="reference internal" href="#id3" id="id15">Dependencies</a></li> |
| <li><a class="reference internal" href="#id4" id="id16">Function reference</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#standard-functions" id="id17">Standard Functions</a><ul> |
| <li><a class="reference internal" href="#id5" id="id18">Dependencies</a></li> |
| <li><a class="reference internal" href="#id6" id="id19">Function reference</a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="custom-index container"></div><div class="section" id="password-hashing"> |
| <h2><a class="toc-backref" href="#id7">Password Hashing</a><a class="headerlink" href="#password-hashing" title="Permalink to this headline">¶</a></h2> |
| <p>This set of compatibility functions offers a “backport” of PHP’s |
| standard <a class="reference external" href="http://php.net/password">Password Hashing extension</a> |
| that is otherwise available only since PHP 5.5.</p> |
| <div class="section" id="dependencies"> |
| <h3><a class="toc-backref" href="#id8">Dependencies</a><a class="headerlink" href="#dependencies" title="Permalink to this headline">¶</a></h3> |
| <ul class="simple"> |
| <li>PHP 5.3.7</li> |
| <li><code class="docutils literal"><span class="pre">CRYPT_BLOWFISH</span></code> support for <code class="docutils literal"><span class="pre">crypt()</span></code></li> |
| </ul> |
| </div> |
| <div class="section" id="constants"> |
| <h3><a class="toc-backref" href="#id9">Constants</a><a class="headerlink" href="#constants" title="Permalink to this headline">¶</a></h3> |
| <ul class="simple"> |
| <li><code class="docutils literal"><span class="pre">PASSWORD_BCRYPT</span></code></li> |
| <li><code class="docutils literal"><span class="pre">PASSWORD_DEFAULT</span></code></li> |
| </ul> |
| </div> |
| <div class="section" id="function-reference"> |
| <h3><a class="toc-backref" href="#id10">Function reference</a><a class="headerlink" href="#function-reference" title="Permalink to this headline">¶</a></h3> |
| <dl class="function"> |
| <dt id="password_get_info"> |
| <code class="descname">password_get_info</code><span class="sig-paren">(</span><em>$hash</em><span class="sig-paren">)</span><a class="headerlink" href="#password_get_info" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$hash</strong> (<em>string</em>) – Password hash</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Information about the hashed password</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For more information, please refer to the <a class="reference external" href="http://php.net/password_get_info">PHP manual for |
| password_get_info()</a>.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="password_hash"> |
| <code class="descname">password_hash</code><span class="sig-paren">(</span><em>$password</em>, <em>$algo</em><span class="optional">[</span>, <em>$options = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#password_hash" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$password</strong> (<em>string</em>) – Plain-text password</li> |
| <li><strong>$algo</strong> (<em>int</em>) – Hashing algorithm</li> |
| <li><strong>$options</strong> (<em>array</em>) – Hashing options</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Hashed password or FALSE on failure</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>For more information, please refer to the <a class="reference external" href="http://php.net/password_hash">PHP manual for |
| password_hash()</a>.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">Unless you provide your own (and valid) salt, this function |
| has a further dependency on an available CSPRNG source. Each |
| of the following would satisfy that: |
| - <code class="docutils literal"><span class="pre">mcrypt_create_iv()</span></code> with <code class="docutils literal"><span class="pre">MCRYPT_DEV_URANDOM</span></code> |
| - <code class="docutils literal"><span class="pre">openssl_random_pseudo_bytes()</span></code> |
| - /dev/arandom |
| - /dev/urandom</p> |
| </div> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="password_needs_rehash"> |
| <code class="descname">password_needs_rehash</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#password_needs_rehash" 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>$hash</strong> (<em>string</em>) – Password hash</li> |
| <li><strong>$algo</strong> (<em>int</em>) – Hashing algorithm</li> |
| <li><strong>$options</strong> (<em>array</em>) – Hashing options</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the hash should be rehashed to match the given algorithm and options, FALSE otherwise</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For more information, please refer to the <a class="reference external" href="http://php.net/password_needs_rehash">PHP manual for |
| password_needs_rehash()</a>.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="password_verify"> |
| <code class="descname">password_verify</code><span class="sig-paren">(</span><em>$password</em>, <em>$hash</em><span class="sig-paren">)</span><a class="headerlink" href="#password_verify" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$password</strong> (<em>string</em>) – Plain-text password</li> |
| <li><strong>$hash</strong> (<em>string</em>) – Password hash</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the password matches the hash, FALSE if not</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For more information, please refer to the <a class="reference external" href="http://php.net/password_verify">PHP manual for |
| password_verify()</a>.</p> |
| </dd></dl> |
| |
| </div> |
| </div> |
| <div class="section" id="hash-message-digest"> |
| <h2><a class="toc-backref" href="#id11">Hash (Message Digest)</a><a class="headerlink" href="#hash-message-digest" title="Permalink to this headline">¶</a></h2> |
| <p>This compatibility layer contains backports for the <code class="docutils literal"><span class="pre">hash_equals()</span></code> |
| and <code class="docutils literal"><span class="pre">hash_pbkdf2()</span></code> functions, which otherwise require PHP 5.6 and/or |
| PHP 5.5 respectively.</p> |
| <div class="section" id="id1"> |
| <h3><a class="toc-backref" href="#id12">Dependencies</a><a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3> |
| <ul class="simple"> |
| <li>None</li> |
| </ul> |
| </div> |
| <div class="section" id="id2"> |
| <h3><a class="toc-backref" href="#id13">Function reference</a><a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3> |
| <dl class="function"> |
| <dt id="hash_equals"> |
| <code class="descname">hash_equals</code><span class="sig-paren">(</span><em>$known_string</em>, <em>$user_string</em><span class="sig-paren">)</span><a class="headerlink" href="#hash_equals" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$known_string</strong> (<em>string</em>) – Known string</li> |
| <li><strong>$user_string</strong> (<em>string</em>) – User-supplied string</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the strings match, FALSE otherwise</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For more information, please refer to the <a class="reference external" href="http://php.net/hash_equals">PHP manual for |
| hash_equals()</a>.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="hash_pbkdf2"> |
| <code class="descname">hash_pbkdf2</code><span class="sig-paren">(</span><em>$algo</em>, <em>$password</em>, <em>$salt</em>, <em>$iterations</em><span class="optional">[</span>, <em>$length = 0</em><span class="optional">[</span>, <em>$raw_output = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#hash_pbkdf2" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$algo</strong> (<em>string</em>) – Hashing algorithm</li> |
| <li><strong>$password</strong> (<em>string</em>) – Password</li> |
| <li><strong>$salt</strong> (<em>string</em>) – Hash salt</li> |
| <li><strong>$iterations</strong> (<em>int</em>) – Number of iterations to perform during derivation</li> |
| <li><strong>$length</strong> (<em>int</em>) – Output string length</li> |
| <li><strong>$raw_output</strong> (<em>bool</em>) – Whether to return raw binary data</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Password-derived key or FALSE on failure</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For more information, please refer to the <a class="reference external" href="http://php.net/hash_pbkdf2">PHP manual for |
| hash_pbkdf2()</a>.</p> |
| </dd></dl> |
| |
| </div> |
| </div> |
| <div class="section" id="multibyte-string"> |
| <h2><a class="toc-backref" href="#id14">Multibyte String</a><a class="headerlink" href="#multibyte-string" title="Permalink to this headline">¶</a></h2> |
| <p>This set of compatibility functions offers limited support for PHP’s |
| <a class="reference external" href="http://php.net/mbstring">Multibyte String extension</a>. Because of |
| the limited alternative solutions, only a few functions are available.</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">When a character set parameter is ommited, |
| <code class="docutils literal"><span class="pre">$config['charset']</span></code> will be used.</p> |
| </div> |
| <div class="section" id="id3"> |
| <h3><a class="toc-backref" href="#id15">Dependencies</a><a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h3> |
| <ul class="simple"> |
| <li><a class="reference external" href="http://php.net/iconv">iconv</a> extension</li> |
| </ul> |
| <div class="admonition important"> |
| <p class="first admonition-title">Important</p> |
| <p class="last">This dependency is optional and these functions will |
| always be declared. If iconv is not available, they WILL |
| fall-back to their non-mbstring versions.</p> |
| </div> |
| <div class="admonition important"> |
| <p class="first admonition-title">Important</p> |
| <p class="last">Where a character set is supplied, it must be |
| supported by iconv and in a format that it recognizes.</p> |
| </div> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">For you own dependency check on the actual mbstring |
| extension, use the <code class="docutils literal"><span class="pre">MB_ENABLED</span></code> constant.</p> |
| </div> |
| </div> |
| <div class="section" id="id4"> |
| <h3><a class="toc-backref" href="#id16">Function reference</a><a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h3> |
| <dl class="function"> |
| <dt id="mb_strlen"> |
| <code class="descname">mb_strlen</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$encoding = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#mb_strlen" 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>$str</strong> (<em>string</em>) – Input string</li> |
| <li><strong>$encoding</strong> (<em>string</em>) – Character set</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Number of characters in the input string or FALSE on failure</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>For more information, please refer to the <a class="reference external" href="http://php.net/mb_strlen">PHP manual for |
| mb_strlen()</a>.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="mb_strpos"> |
| <code class="descname">mb_strpos</code><span class="sig-paren">(</span><em>$haystack</em>, <em>$needle</em><span class="optional">[</span>, <em>$offset = 0</em><span class="optional">[</span>, <em>$encoding = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#mb_strpos" 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>$haystack</strong> (<em>string</em>) – String to search in</li> |
| <li><strong>$needle</strong> (<em>string</em>) – Part of string to search for</li> |
| <li><strong>$offset</strong> (<em>int</em>) – Search offset</li> |
| <li><strong>$encoding</strong> (<em>string</em>) – Character set</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Numeric character position of where $needle was found or FALSE if not found</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For more information, please refer to the <a class="reference external" href="http://php.net/mb_strpos">PHP manual for |
| mb_strpos()</a>.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="mb_substr"> |
| <code class="descname">mb_substr</code><span class="sig-paren">(</span><em>$str</em>, <em>$start</em><span class="optional">[</span>, <em>$length = NULL</em><span class="optional">[</span>, <em>$encoding = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#mb_substr" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$str</strong> (<em>string</em>) – Input string</li> |
| <li><strong>$start</strong> (<em>int</em>) – Position of first character</li> |
| <li><strong>$length</strong> (<em>int</em>) – Maximum number of characters</li> |
| <li><strong>$encoding</strong> (<em>string</em>) – Character set</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Portion of $str specified by $start and $length or FALSE on failure</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>For more information, please refer to the <a class="reference external" href="http://php.net/mb_substr">PHP manual for |
| mb_substr()</a>.</p> |
| </dd></dl> |
| |
| </div> |
| </div> |
| <div class="section" id="standard-functions"> |
| <h2><a class="toc-backref" href="#id17">Standard Functions</a><a class="headerlink" href="#standard-functions" title="Permalink to this headline">¶</a></h2> |
| <p>This set of compatibility functions offers support for a few |
| standard functions in PHP that otherwise require a newer PHP version.</p> |
| <div class="section" id="id5"> |
| <h3><a class="toc-backref" href="#id18">Dependencies</a><a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h3> |
| <ul class="simple"> |
| <li>None</li> |
| </ul> |
| </div> |
| <div class="section" id="id6"> |
| <h3><a class="toc-backref" href="#id19">Function reference</a><a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h3> |
| <dl class="function"> |
| <dt id="array_column"> |
| <code class="descname">array_column</code><span class="sig-paren">(</span><em>array $array</em>, <em>$column_key</em><span class="optional">[</span>, <em>$index_key = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#array_column" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$array</strong> (<em>array</em>) – Array to fetch results from</li> |
| <li><strong>$column_key</strong> (<em>mixed</em>) – Key of the column to return values from</li> |
| <li><strong>$index_key</strong> (<em>mixed</em>) – Key to use for the returned values</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An array of values representing a single column from the input array</p> |
| </td> |
| </tr> |
| <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <p>For more information, please refer to the <a class="reference external" href="http://php.net/array_column">PHP manual for |
| array_column()</a>.</p> |
| </dd></dl> |
| |
| <dl class="function"> |
| <dt id="hex2bin"> |
| <code class="descname">hex2bin</code><span class="sig-paren">(</span><em>$data</em><span class="sig-paren">)</span><a class="headerlink" href="#hex2bin" title="Permalink to this definition">¶</a></dt> |
| <dd><table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> |
| <li><strong>$data</strong> (<em>array</em>) – Hexadecimal representation of data</li> |
| </ul> |
| </td> |
| </tr> |
| <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Binary representation of the given data</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>For more information, please refer to the <a class="reference external" href="http://php.net/hex2bin">PHP manual for hex2bin()</a>.</p> |
| </dd></dl> |
| |
| </div> |
| </div> |
| </div> |
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