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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>Computes the intersection of arrays using keys for comparison</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-intersect-assoc.html">array_intersect_assoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-intersect-uassoc.html">array_intersect_uassoc</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-intersect-key" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_intersect_key</h1> <p class="verinfo">(PHP 5 >= 5.1.0)</p><p class="refpurpose"><span class="refname">array_intersect_key</span> — <span class="dc-title">Computes the intersection of arrays using keys for comparison</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_intersect_key</b></b></span> ( <span class="methodparam"><span class="type">array</span> <tt class="parameter">$array1</tt></span> , <span class="methodparam"><span class="type">array</span> <tt class="parameter">$array2</tt></span> [, <span class="methodparam"><span class="type">array</span> <tt class="parameter">$ ...</tt></span> ] )</div> <p class="para rdfs-comment"> <b>array_intersect_key()</b> returns an array containing all the values of <i><tt class="parameter">array1</tt></i> which have matching keys that are present in all the arguments. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">array1</tt></i></span> <dd> <p class="para"> The array with master keys to check. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">array2</tt></i></span> <dd> <p class="para"> An array to compare keys against. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">array</tt></i></span> <dd> <p class="para"> A variable list of arrays to compare. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an associative array containing all the values of <i><tt class="parameter">array1</tt></i> which have matching keys that are present in all arguments. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>array_intersect_key()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$array1 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'blue' </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">'red' </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">'green' </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">'purple' </span><span style="color: #007700">=> </span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'green' </span><span style="color: #007700">=> </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #DD0000">'blue' </span><span style="color: #007700">=> </span><span style="color: #0000BB">6</span><span style="color: #007700">, </span><span style="color: #DD0000">'yellow' </span><span style="color: #007700">=> </span><span style="color: #0000BB">7</span><span style="color: #007700">, </span><span style="color: #DD0000">'cyan' </span><span style="color: #007700">=> </span><span style="color: #0000BB">8</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">array_intersect_key</span><span style="color: #007700">(</span><span style="color: #0000BB">$array1</span><span style="color: #007700">, </span><span style="color: #0000BB">$array2</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>array(2) { ["blue"]=> int(1) ["green"]=> int(3)}</pre></div> </pre></div> </div> </p> <p class="para"> In our example you see that only the keys <i>'blue'</i> and <i>'green'</i> are present in both arrays and thus returned. Also notice that the values for the keys <i>'blue'</i> and <i>'green'</i> differ between the two arrays. A match still occurs because only the keys are checked. The values returned are those of <i><tt class="parameter">array1</tt></i>. </p> <p class="para"> The two keys from the <i>key => value</i> pairs are considered equal only if <i>(string) $key1 === (string) $key2 </i>. In other words a strict type check is executed so the string representation must be the same. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.array-diff.html" class="function" rel="rdfs-seeAlso">array_diff()</a></li> <li class="member"><a href="function.array-udiff.html" class="function" rel="rdfs-seeAlso">array_udiff()</a></li> <li class="member"><a href="function.array-diff-assoc.html" class="function" rel="rdfs-seeAlso">array_diff_assoc()</a></li> <li class="member"><a href="function.array-diff-uassoc.html" class="function" rel="rdfs-seeAlso">array_diff_uassoc()</a></li> <li class="member"><a href="function.array-udiff-assoc.html" class="function" rel="rdfs-seeAlso">array_udiff_assoc()</a></li> <li class="member"><a href="function.array-udiff-uassoc.html" class="function" rel="rdfs-seeAlso">array_udiff_uassoc()</a></li> <li class="member"><a href="function.array-diff-key.html" class="function" rel="rdfs-seeAlso">array_diff_key()</a></li> <li class="member"><a href="function.array-diff-ukey.html" class="function" rel="rdfs-seeAlso">array_diff_ukey()</a></li> <li class="member"><a href="function.array-intersect.html" class="function" rel="rdfs-seeAlso">array_intersect()</a></li> <li class="member"><a href="function.array-intersect-assoc.html" class="function" rel="rdfs-seeAlso">array_intersect_assoc()</a></li> <li class="member"><a href="function.array-intersect-uassoc.html" class="function" rel="rdfs-seeAlso">array_intersect_uassoc()</a></li> <li class="member"><a href="function.array-intersect-ukey.html" class="function" rel="rdfs-seeAlso">array_intersect_ukey()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.array-intersect-assoc.html">array_intersect_assoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-intersect-uassoc.html">array_intersect_uassoc</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>⌨️ 快捷键说明
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