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diff --git a/user_guide/general/compatibility_functions.html b/user_guide/general/compatibility_functions.html new file mode 100644 index 000000000..bd9d5ad9f --- /dev/null +++ b/user_guide/general/compatibility_functions.html @@ -0,0 +1,914 @@ + + +<!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>Compatibility Functions — CodeIgniter 3.1.10 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" + 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src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> + </div> + </ul> + <hr/> +</div> + <div role="main" class="document"> + + <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> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="routing.html" class="btn btn-neutral float-right" title="URI Routing">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="common_functions.html" class="btn btn-neutral" title="Common Functions"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2019, 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