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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 a callback function on the 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-uassoc.html">array_intersect_uassoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-intersect.html">array_intersect</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-ukey" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_intersect_ukey</h1> <p class="verinfo">(PHP 5 >= 5.1.0)</p><p class="refpurpose"><span class="refname">array_intersect_ukey</span> — <span class="dc-title">Computes the intersection of arrays using a callback function on the 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_ukey</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">$...</tt></span> ], <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$key_compare_func</tt></span> )</div> <p class="para rdfs-comment"> <b>array_intersect_ukey()</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> <p class="para"> This comparison is done by a user supplied callback function. It must return an integer less than, equal to, or greater than zero if the first key is considered to be respectively less than, equal to, or greater than the second. </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"> Initial array for comparision of the arrays. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">array2</tt></i></span> <dd> <p class="para"> First array to compare keys against. </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 compare keys against. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">key_compare_func</tt></i></span> <dd> <p class="para"> User supplied callback function to do the comparision. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the values of <i><tt class="parameter">array1</tt></i> whose keys exist in all the 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_ukey()</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">key_compare_func</span><span style="color: #007700">(</span><span style="color: #0000BB">$key1</span><span style="color: #007700">, </span><span style="color: #0000BB">$key2</span><span style="color: #007700">)<br />{<br /> if (</span><span style="color: #0000BB">$key1 </span><span style="color: #007700">== </span><span style="color: #0000BB">$key2</span><span style="color: #007700">)<br /> return </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /> else if (</span><span style="color: #0000BB">$key1 </span><span style="color: #007700">> </span><span style="color: #0000BB">$key2</span><span style="color: #007700">)<br /> return </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br /> else<br /> return -</span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$array1 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'blue' </span><span style="color: #007700">=> </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">'red' </span><span style="color: #007700">=> </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">'green' </span><span style="color: #007700">=> </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">'purple' </span><span style="color: #007700">=> </span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$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_ukey</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">, </span><span style="color: #DD0000">'key_compare_func'</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> </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-key.html" class="function" rel="rdfs-seeAlso">array_intersect_key()</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-uassoc.html">array_intersect_uassoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-intersect.html">array_intersect</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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