<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Perform the rot13 transform on a string</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.str-replace.html">str_replace</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.str-shuffle.html">str_shuffle</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.str-rot13" class="refentry"> <div class="refnamediv"> <h1 class="refname">str_rot13</h1> <p class="verinfo">(PHP 4 >= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">str_rot13</span> — <span class="dc-title">Perform the rot13 transform on a string</span></p> </div> <div class="refsect1 description" id="refsect1-function.str-rot13-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><strong>str_rot13</strong></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span> )</div> <p class="para rdfs-comment"> Performs the ROT13 encoding on the <em><code class="parameter">str</code></em> argument and returns the resulting string. </p> <p class="para"> The ROT13 encoding simply shifts every letter by 13 places in the alphabet while leaving non-alpha characters untouched. Encoding and decoding are done by the same function, passing an encoded string as argument will return the original version. </p> </div> <div class="refsect1 parameters" id="refsect1-function.str-rot13-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">str</code></em></span> <dd> <p class="para"> The input string. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.str-rot13-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the ROT13 version of the given string. </p> </div> <div class="refsect1 examples" id="refsect1-function.str-rot13-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-4880"> <p><strong>Example #1 <span class="function"><strong>str_rot13()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_rot13</span><span style="color: #007700">(</span><span style="color: #DD0000">'PHP 4.3.0'</span><span style="color: #007700">); </span><span style="color: #FF8000">// CUC 4.3.0<br /><br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </p> </div> <div class="refsect1 changelog" id="refsect1-function.str-rot13-changelog"> <h3 class="title">Changelog</h3> <p class="para"> <table class="doctable informaltable"> <thead> <tr> <th>Version</th> <th>Description</th> </tr> </thead> <tbody class="tbody"> <tr> <td>4.3.0</td> <td> The behaviour of this function was fixed. Before this fix, the <em><code class="parameter">str</code></em> was also modified, as if it was passed by reference. </td> </tr> </tbody> </table> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.str-replace.html">str_replace</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.str-shuffle.html">str_shuffle</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>