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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Applies the callback to the elements of the given arrays</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.array-keys.html">array_keys</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-merge-recursive.html">array_merge_recursive</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-map" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_map</h1> <p class="verinfo">(PHP 4 >= 4.0.6, PHP 5)</p><p class="refpurpose"><span class="refname">array_map</span> — <span class="dc-title">Applies the callback to the elements of the given arrays</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><b><b>array_map</b></b></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$callback</tt></span> , <span class="methodparam"><span class="type">array</span> <tt class="parameter">$arr1</tt></span> [, <span class="methodparam"><span class="type">array</span> <tt class="parameter">$...</tt></span> ] )</div> <p class="para rdfs-comment"> <b>array_map()</b> returns an array containing all the elements of <i><tt class="parameter">arr1</tt></i> after applying the <i><tt class="parameter">callback</tt></i> function to each one. The number of parameters that the <i><tt class="parameter">callback</tt></i> function accepts should match the number of arrays passed to the <b>array_map()</b> </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">callback</tt></i></span> <dd> <p class="para"> Callback function to run for each element in each array. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">arr1</tt></i></span> <dd> <p class="para"> An array to run through the <i><tt class="parameter">callback</tt></i> function. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">array</tt></i></span> <dd> <p class="para"> Variable list of array arguments to run through the <i><tt class="parameter">callback</tt></i> function. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an array containing all the elements of <i><tt class="parameter">arr1</tt></i> after applying the <i><tt class="parameter">callback</tt></i> function to each one. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>array_map()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">cube</span><span style="color: #007700">(</span><span style="color: #0000BB">$n</span><span style="color: #007700">)<br />{<br /> return(</span><span style="color: #0000BB">$n </span><span style="color: #007700">* </span><span style="color: #0000BB">$n </span><span style="color: #007700">* </span><span style="color: #0000BB">$n</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">$a </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= </span><span style="color: #0000BB">array_map</span><span style="color: #007700">(</span><span style="color: #DD0000">"cube"</span><span style="color: #007700">, </span><span style="color: #0000BB">$a</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$b</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p> This makes <var class="varname">$b</var> have: </p></div> <div class="example-contents"><pre><div class="cdata"><pre>Array( [0] => 1 [1] => 8 [2] => 27 [3] => 64 [4] => 125)</pre></div> </pre></div> </div> <div class="example"> <p><b>Example #2 <b>array_map()</b> using lambda function (as of PHP 5.3.0)</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">/* As of PHP 5.3.0 */<br /><br /></span><span style="color: #0000BB">$func </span><span style="color: #007700">= function(</span><span style="color: #0000BB">$value</span><span style="color: #007700">) { return </span><span style="color: #0000BB">$value </span><span style="color: #007700">* </span><span style="color: #0000BB">2</span><span style="color: #007700">; };<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">array_map</span><span style="color: #007700">(</span><span style="color: #0000BB">$func</span><span style="color: #007700">, </span><span style="color: #0000BB">range</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">)));<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><pre><div class="cdata"><pre>Array( [0] => 2 [1] => 4 [2] => 6 [3] => 8 [4] => 10)</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #3 <b>array_map()</b> - using more arrays</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">show_Spanish</span><span style="color: #007700">(</span><span style="color: #0000BB">$n</span><span style="color: #007700">, </span><span style="color: #0000BB">$m</span><span style="color: #007700">)<br />{<br /> return(</span><span style="color: #DD0000">"The number $n is called $m in Spanish"</span><span style="color: #007700">);<br />}<br /><br />function </span><span style="color: #0000BB">map_Spanish</span><span style="color: #007700">(</span><span style="color: #0000BB">$n</span><span style="color: #007700">, </span><span style="color: #0000BB">$m</span><span style="color: #007700">)<br />{<br /> return(array(</span><span style="color: #0000BB">$n </span><span style="color: #007700">=> </span><span style="color: #0000BB">$m</span><span style="color: #007700">));<br />}<br /><br /></span><span style="color: #0000BB">$a </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"uno"</span><span style="color: #007700">, </span><span style="color: #DD0000">"dos"</span><span style="color: #007700">, </span><span style="color: #DD0000">"tres"</span><span style="color: #007700">, </span><span style="color: #DD0000">"cuatro"</span><span style="color: #007700">, </span><span style="color: #DD0000">"cinco"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= </span><span style="color: #0000BB">array_map</span><span style="color: #007700">(</span><span style="color: #DD0000">"show_Spanish"</span><span style="color: #007700">, </span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$d </span><span style="color: #007700">= </span><span style="color: #0000BB">array_map</span><span style="color: #007700">(</span><span style="color: #DD0000">"map_Spanish"</span><span style="color: #007700">, </span><span style="color: #0000BB">$a </span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$d</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"><pre><div class="cdata"><pre>// printout of $cArray( [0] => The number 1 is called uno in Spanish⌨️ 快捷键说明
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