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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 by using a callback function for data 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-udiff-uassoc.html">array_udiff_uassoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-uintersect-assoc.html">array_uintersect_assoc</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-udiff" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_udiff</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">array_udiff</span> — <span class="dc-title">Computes the difference of arrays by using a callback function for data 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_udiff</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">$data_compare_func</tt></span> )</div> <p class="para rdfs-comment"> Computes the difference of arrays by using a callback function for data comparison. This is unlike <a href="function.array-diff.html" class="function">array_diff()</a> which uses an internal function for comparing the data. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">array1</tt></i></span> <dd> <p class="para"> The first array. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">array2</tt></i></span> <dd> <p class="para"> The second array. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">data_compare_func</tt></i></span> <dd> <p class="para"> The callback comparison function. </p> <p class="para"> The user supplied callback function is used for comparison. It must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an array containing all the values of <i><tt class="parameter">array1</tt></i> that are not present in any of the other arguments. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>array_udiff()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">cr </span><span style="color: #007700">{<br /> private </span><span style="color: #0000BB">$priv_member</span><span style="color: #007700">;<br /> function </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">$val</span><span style="color: #007700">)<br /> {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">priv_member </span><span style="color: #007700">= </span><span style="color: #0000BB">$val</span><span style="color: #007700">;<br /> }<br /><br /> static function </span><span style="color: #0000BB">comp_func_cr</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">priv_member </span><span style="color: #007700">=== </span><span style="color: #0000BB">$b</span><span style="color: #007700">-></span><span style="color: #0000BB">priv_member</span><span style="color: #007700">) return </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /> return (</span><span style="color: #0000BB">$a</span><span style="color: #007700">-></span><span style="color: #0000BB">priv_member </span><span style="color: #007700">> </span><span style="color: #0000BB">$b</span><span style="color: #007700">-></span><span style="color: #0000BB">priv_member</span><span style="color: #007700">)? </span><span style="color: #0000BB">1</span><span style="color: #007700">:-</span><span style="color: #0000BB">1</span><span style="color: #007700">;<br /> }<br />}<br /></span><span style="color: #0000BB">$a </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"0.1" </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">9</span><span style="color: #007700">), </span><span style="color: #DD0000">"0.5" </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">12</span><span style="color: #007700">), </span><span style="color: #0000BB">0 </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">23</span><span style="color: #007700">), </span><span style="color: #0000BB">1</span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">4</span><span style="color: #007700">), </span><span style="color: #0000BB">2 </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(-</span><span style="color: #0000BB">15</span><span style="color: #007700">),);<br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"0.2" </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">9</span><span style="color: #007700">), </span><span style="color: #DD0000">"0.5" </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">22</span><span style="color: #007700">), </span><span style="color: #0000BB">0 </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">3</span><span style="color: #007700">), </span><span style="color: #0000BB">1</span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(</span><span style="color: #0000BB">4</span><span style="color: #007700">), </span><span style="color: #0000BB">2 </span><span style="color: #007700">=> new </span><span style="color: #0000BB">cr</span><span style="color: #007700">(-</span><span style="color: #0000BB">15</span><span style="color: #007700">),);<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_udiff</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">, array(</span><span style="color: #DD0000">"cr"</span><span style="color: #007700">, </span><span style="color: #DD0000">"comp_func_cr"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>Array( [0.5] => cr Object ( [priv_member:private] => 12 ) [0] => cr Object ( [priv_member:private] => 23 ))</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <span class="simpara"> Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using <i>array_udiff($array1[0], $array2[0], "data_compare_func");</i>. </span> </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-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-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-udiff-uassoc.html">array_udiff_uassoc</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-uintersect-assoc.html">array_uintersect_assoc</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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