function.in-array.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>Checks if a value exists in an array</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.extract.html">extract</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.key.html">key</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.in-array" class="refentry"> <div class="refnamediv"> <h1 class="refname">in_array</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">in_array</span> — <span class="dc-title">Checks if a value exists in an array</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>in_array</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>in_array()</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 <b><tt>TRUE</tt></b> if <i><tt class="parameter">needle</tt></i> is found in the array, <b><tt>FALSE</tt></b> otherwise. </p> </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"> <i><tt class="parameter">needle</tt></i> may now be an array. </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>in_array()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$os </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"Mac"</span><span style="color: #007700">, </span><span style="color: #DD0000">"NT"</span><span style="color: #007700">, </span><span style="color: #DD0000">"Irix"</span><span style="color: #007700">, </span><span style="color: #DD0000">"Linux"</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">in_array</span><span style="color: #007700">(</span><span style="color: #DD0000">"Irix"</span><span style="color: #007700">, </span><span style="color: #0000BB">$os</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Got Irix"</span><span style="color: #007700">;<br />}<br />if (</span><span style="color: #0000BB">in_array</span><span style="color: #007700">(</span><span style="color: #DD0000">"mac"</span><span style="color: #007700">, </span><span style="color: #0000BB">$os</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Got mac"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p> The second condition fails because <b>in_array()</b> is case-sensitive, so the program above will display: </p></div> <div class="example-contents"><pre><div class="cdata"><pre>Got Irix</pre></div> </pre></div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 <b>in_array()</b> with strict example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'1.10'</span><span style="color: #007700">, </span><span style="color: #0000BB">12.4</span><span style="color: #007700">, </span><span style="color: #0000BB">1.13</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">in_array</span><span style="color: #007700">(</span><span style="color: #DD0000">'12.4'</span><span style="color: #007700">, </span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"'12.4' found with strict check\n"</span><span style="color: #007700">;<br />}<br /><br />if (</span><span style="color: #0000BB">in_array</span><span style="color: #007700">(</span><span style="color: #0000BB">1.13</span><span style="color: #007700">, </span><span style="color: #0000BB">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"1.13 found with strict check\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>1.13 found with strict check</pre></div> </pre></div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #3 <b>in_array()</b> with an array as needle</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= array(array(</span><span style="color: #DD0000">'p'</span><span style="color: #007700">, </span><span style="color: #DD0000">'h'</span><span style="color: #007700">), array(</span><span style="color: #DD0000">'p'</span><span style="color: #007700">, </span><span style="color: #DD0000">'r'</span><span style="color: #007700">), </span><span style="color: #DD0000">'o'</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">in_array</span><span style="color: #007700">(array(</span><span style="color: #DD0000">'p'</span><span style="color: #007700">, </span><span style="color: #DD0000">'h'</span><span style="color: #007700">), </span><span style="color: #0000BB">$a</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"'ph' was found\n"</span><span style="color: #007700">;<br />}<br /><br />if (</span><span style="color: #0000BB">in_array</span><span style="color: #007700">(array(</span><span style="color: #DD0000">'f'</span><span style="color: #007700">, </span><span style="color: #DD0000">'i'</span><span style="color: #007700">), </span><span style="color: #0000BB">$a</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"'fi' was found\n"</span><span style="color: #007700">;<br />}<br /><br />if (</span><span style="color: #0000BB">in_array</span><span style="color: #007700">(</span><span style="color: #DD0000">'o'</span><span style="color: #007700">, </span><span style="color: #0000BB">$a</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"'o' was found\n"</span><span style="color: #007700">;<br />}<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> 'ph' was found 'o' was found</pre></div> </pre></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-search.html" class="function" rel="rdfs-seeAlso">array_search()</a></li> <li class="member"><a href="function.isset.html" class="function" rel="rdfs-seeAlso">isset()</a></li> <li class="member"><a href="function.array-key-exists.html" class="function" rel="rdfs-seeAlso">array_key_exists()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.extract.html">extract</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.key.html">key</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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