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162 lines
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162 lines
10 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>检查数组中是否存在某个值</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.in-array" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">in_array</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">in_array</span> — <span class="dc-title">检查数组中是否存在某个值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.in-array-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>in_array</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$needle</code></span>
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, <span class="methodparam"><span class="type">array</span> <code class="parameter">$haystack</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$strict</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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大海捞针，在大海（<code class="parameter">haystack</code>）中搜索针（
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<code class="parameter">needle</code>），如果没有设置 <code class="parameter">strict</code> 则使用宽松的比较。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.in-array-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">needle</code></dt>
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<dd>
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<p class="para">
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待搜索的值。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果 <code class="parameter">needle</code> 是字符串，则比较是区分大小写的。
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</p>
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</p></blockquote>
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</dd>
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<dt>
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<code class="parameter">haystack</code></dt>
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<dd>
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<p class="para">
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待搜索的数组。
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</p>
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</dd>
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<dt>
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<code class="parameter">strict</code></dt>
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<dd>
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<p class="para">
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如果第三个参数 <code class="parameter">strict</code> 的值为
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<strong><code>TRUE</code></strong> 则 <span class="function"><strong>in_array()</strong></span> 函数还会检查
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<code class="parameter">needle</code> 的<a href="language.types.html" class="link">类型</a>是否和
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<code class="parameter">haystack</code> 中的相同。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.in-array-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">如果找到 <code class="parameter">needle</code> 则返回 <strong><code>TRUE</code></strong>，否则返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.in-array-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-6097">
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<p><strong>Example #1 <span class="function"><strong>in_array()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<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>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>
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第二个条件失败，因为 <span class="function"><strong>in_array()</strong></span>
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是区分大小写的，所以以上程序显示为：
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Got Irix
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-6098">
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<p><strong>Example #2 <span class="function"><strong>in_array()</strong></span> 严格类型检查例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<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">$a</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"1.13 found with strict check\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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1.13 found with strict check
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-6099">
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<p><strong>Example #3 <span class="function"><strong>in_array()</strong></span> 中用数组作为 needle</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$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>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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'ph' was found
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'o' was found
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.in-array-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="array_search.html" class="function" rel="rdfs-seeAlso">array_search()</a> - 在数组中搜索给定的值，如果成功则返回首个相应的键名</span></li>
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<li class="member"><span class="function"><a href="isset.html" class="function" rel="rdfs-seeAlso">isset()</a> - 检测变量是否已设置并且非 NULL</span></li>
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<li class="member"><span class="function"><a href="array_key_exists.html" class="function" rel="rdfs-seeAlso">array_key_exists()</a> - 检查数组里是否有指定的键名或索引</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |