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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 difference of arrays with additional index check which is performed by a user supplied callback function</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-diff-key.html">array_diff_key</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-diff-ukey.html">array_diff_ukey</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-diff-uassoc" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_diff_uassoc</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">array_diff_uassoc</span> — <span class="dc-title">Computes the difference of arrays with additional index check which is performed by a user supplied callback function</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_diff_uassoc</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"> Compares <i><tt class="parameter">array1</tt></i> against <i><tt class="parameter">array2</tt></i> and returns the difference. Unlike <a href="function.array-diff.html" class="function">array_diff()</a> the array keys are used in the comparision. </p> <p class="para"> Unlike <a href="function.array-diff-assoc.html" class="function">array_diff_assoc()</a> an user supplied callback function is used for the indices comparision, not internal function. </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 to compare from </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">array2</tt></i></span> <dd> <p class="para"> An array to compare against </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">...</tt></i></span> <dd> <p class="para"> More arrays to compare against </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">key_compare_func</tt></i></span> <dd> <p class="para"> <a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a> function to use. The callback function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an <a href="language.types.array.html" class="type array">array</a> containing all the entries from <i><tt class="parameter">array1</tt></i> that are not present in any of the other arrays. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>array_diff_uassoc()</b> example</b></p> <div class="example-contents"><p> The <i>"a" => "green"</i> pair is present in both arrays and thus it is not in the ouput from the function. Unlike this, the pair <i>0 => "red"</i> is in the ouput because in the second argument <i>"red"</i> has key which is <i>1</i>. </p></div> <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">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">$b</span><span style="color: #007700">)<br />{<br /> if (</span><span style="color: #0000BB">$a </span><span style="color: #007700">=== </span><span style="color: #0000BB">$b</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /> }<br /> return (</span><span style="color: #0000BB">$a </span><span style="color: #007700">> </span><span style="color: #0000BB">$b</span><span style="color: #007700">)? </span><span style="color: #0000BB">1</span><span style="color: #007700">:-</span><span style="color: #0000BB">1</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$array1 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"b" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"brown"</span><span style="color: #007700">, </span><span style="color: #DD0000">"c" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">, </span><span style="color: #DD0000">"red"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_diff_uassoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$array1</span><span style="color: #007700">, </span><span style="color: #0000BB">$array2</span><span style="color: #007700">, </span><span style="color: #DD0000">"key_compare_func"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</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( [b] => brown [c] => blue [0] => red)</pre></div> </pre></div> <div class="example-contents"><p> The equality of 2 indices is checked by the user supplied callback function. </p></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, <i>array_diff_uassoc($array1[0], $array2[0], "key_compare_func");</i>. <br /> </p></blockquote> </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-diff-assoc.html" class="function" rel="rdfs-seeAlso">array_diff_assoc()</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-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-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-uintersect.html" class="function" rel="rdfs-seeAlso">array_uintersect()</a></li> <li class="member"><a href="function.array-uintersect-assoc.html" class="function" rel="rdfs-seeAlso">array_uintersect_assoc()</a></li> <li class="member"><a href="function.array-uintersect-uassoc.html" class="function" rel="rdfs-seeAlso">array_uintersect_uassoc()</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-diff-key.html">array_diff_key</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-diff-ukey.html">array_diff_ukey</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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