<!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>Changes the case of all keys in an array</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.array.html">Array Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-chunk.html">array_chunk</a></div> <div class="up"><a href="ref.array.html">Array Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.array-change-key-case" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_change_key_case</h1> <p class="verinfo">(PHP 4 >= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">array_change_key_case</span> — <span class="dc-title">Changes the case of all keys in an array</span></p> </div> <div class="refsect1 description" id="refsect1-function.array-change-key-case-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><strong>array_change_key_case</strong></span> ( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array</code></span> [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$case</code><span class="initializer"> = CASE_LOWER</span></span> ] )</div> <p class="para rdfs-comment"> Returns an array with all keys from <em><code class="parameter">array</code></em> lowercased or uppercased. Numbered indices are left as is. </p> </div> <div class="refsect1 parameters" id="refsect1-function.array-change-key-case-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">array</code></em></span> <dd> <p class="para"> The array to work on </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">case</code></em></span> <dd> <p class="para"> Either <strong><code>CASE_UPPER</code></strong> or <strong><code>CASE_LOWER</code></strong> (default) </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.array-change-key-case-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an array with its keys lower or uppercased, or <strong><code>FALSE</code></strong> if <em><code class="parameter">array</code></em> is not an array. </p> </div> <div class="refsect1 errors" id="refsect1-function.array-change-key-case-errors"> <h3 class="title">Errors/Exceptions</h3> <p class="para"> Throws <strong><code>E_WARNING</code></strong> if <em><code class="parameter">array</code></em> is not an array. </p> </div> <div class="refsect1 examples" id="refsect1-function.array-change-key-case-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="function.array-change-key-case.example-1"> <p><strong>Example #1 <span class="function"><strong>array_change_key_case()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$input_array </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"FirSt" </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">"SecOnd" </span><span style="color: #007700">=> </span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">array_change_key_case</span><span style="color: #007700">(</span><span style="color: #0000BB">$input_array</span><span style="color: #007700">, </span><span style="color: #0000BB">CASE_UPPER</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> Array ( [FIRST] => 1 [SECOND] => 4 ) </pre></div> </div> </div> </p> </div> <div class="refsect1 notes" id="refsect1-function.array-change-key-case-notes"> <h3 class="title">Notes</h3> <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para"> If an array has indices that will be the same once run through this function (e.g. "<em>keY</em>" and "<em>kEY</em>"), the value that is later in the array will override other indices. </p> </p></blockquote> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.array.html">Array Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-chunk.html">array_chunk</a></div> <div class="up"><a href="ref.array.html">Array Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>