function.array-search.html
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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>Searches the array for a given value and returns the corresponding key if successful</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-reverse.html">array_reverse</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-shift.html">array_shift</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-search" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_search</h1> <p class="verinfo">(PHP 4 >= 4.0.5, PHP 5)</p><p class="refpurpose"><span class="refname">array_search</span> — <span class="dc-title">Searches the array for a given value and returns the corresponding key if successful</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><b><b>array_search</b></b></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$needle</tt></span> , <span class="methodparam"><span class="type">array</span> <tt class="parameter">$haystack</tt></span> [, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$strict</tt></span> ] )</div> <p class="para rdfs-comment"> Searches <i><tt class="parameter">haystack</tt></i> for <i><tt class="parameter">needle</tt></i>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">needle</tt></i></span> <dd> <p class="para"> The searched value. </p> <blockquote><p><b class="note">Note</b>: If <i><tt class="parameter">needle</tt></i> is a string, the comparison is done in a case-sensitive manner. <br /> </p></blockquote> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">haystack</tt></i></span> <dd> <p class="para"> The array. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">strict</tt></i></span> <dd> <p class="para"> If the third parameter <i><tt class="parameter">strict</tt></i> is set to <b><tt>TRUE</tt></b> then the <b>array_search()</b> function will also check the <a href="language.types.html" class="link">types</a> of the <i><tt class="parameter">needle</tt></i> in the <i><tt class="parameter">haystack</tt></i>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the key for <i><tt class="parameter">needle</tt></i> if it is found in the array, <b><tt>FALSE</tt></b> otherwise. </p> <p class="para"> If <i><tt class="parameter">needle</tt></i> is found in <i><tt class="parameter">haystack</tt></i> more than once, the first matching key is returned. To return the keys for all matching values, use <a href="function.array-keys.html" class="function">array_keys()</a> with the optional <i><tt class="parameter">search_value</tt></i> parameter instead. </p> <div class="warning"><b class="warning">Warning</b><p class="simpara">This function mayreturn Boolean <b><tt>FALSE</tt></b>, but may also return a non-Boolean value whichevaluates to <b><tt>FALSE</tt></b>, such as <i>0</i> or"". Please read the section on <a href="language.types.boolean.html" class="link">Booleans</a> for moreinformation. Use <a href="language.operators.comparison.html" class="link">the ===operator</a> for testing the return value of thisfunction.</p></div> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.2.0</td> <td colspan="1" rowspan="1" align="left"> Prior to PHP 4.2.0, <b>array_search()</b> returns <b><tt>NULL</tt></b> on failure instead of <b><tt>FALSE</tt></b>. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>array_search()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$array </span><span style="color: #007700">= array(</span><span style="color: #0000BB">0 </span><span style="color: #007700">=> </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">'red'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$key </span><span style="color: #007700">= </span><span style="color: #0000BB">array_search</span><span style="color: #007700">(</span><span style="color: #DD0000">'green'</span><span style="color: #007700">, </span><span style="color: #0000BB">$array</span><span style="color: #007700">); </span><span style="color: #FF8000">// $key = 2;<br /></span><span style="color: #0000BB">$key </span><span style="color: #007700">= </span><span style="color: #0000BB">array_search</span><span style="color: #007700">(</span><span style="color: #DD0000">'red'</span><span style="color: #007700">, </span><span style="color: #0000BB">$array</span><span style="color: #007700">); </span><span style="color: #FF8000">// $key = 1;<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </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-keys.html" class="function" rel="rdfs-seeAlso">array_keys()</a></li> <li class="member"><a href="function.array-values.html" class="function" rel="rdfs-seeAlso">array_values()</a></li> <li class="member"><a href="function.array-key-exists.html" class="function" rel="rdfs-seeAlso">array_key_exists()</a></li> <li class="member"><a href="function.in-array.html" class="function" rel="rdfs-seeAlso">in_array()</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-reverse.html">array_reverse</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-shift.html">array_shift</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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