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161 lines
7.9 KiB
HTML
161 lines
7.9 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>在数组中搜索给定的值，如果成功则返回首个相应的键名</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.array-search" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_search</h1>
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<p class="verinfo">(PHP 4 >= 4.0.5, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_search</span> — <span class="dc-title">
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在数组中搜索给定的值，如果成功则返回首个相应的键名
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-search-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>array_search</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"> = false</span></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></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> 参数）。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-search-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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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，则比较以区分大小写的方式进行。
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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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这个数组。
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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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如果可选的第三个参数 <code class="parameter">strict</code> 为 <strong><code>TRUE</code></strong>，则
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<span class="function"><strong>array_search()</strong></span> 将在 <code class="parameter">haystack</code>
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中检查<em class="emphasis">完全相同</em>的元素。
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这意味着同样严格比较 <code class="parameter">haystack</code> 里 <code class="parameter">needle</code> 的 <a href="language.types.html" class="link">类型</a>，并且对象需是同一个实例。
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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.array-search-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果找到了 <code class="parameter">needle</code> 则返回它的键，否则返回 <strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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如果 <code class="parameter">needle</code> 在
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<code class="parameter">haystack</code>
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中出现不止一次，则返回第一个匹配的键。要返回所有匹配值的键，应该用
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<span class="function"><a href="array_keys.html" class="function">array_keys()</a></span> 加上可选参数
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<code class="parameter">search_value</code> 来代替。
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</p>
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<div class="warning"><strong class="warning">Warning</strong><p class="simpara">此函数可能返回布尔值
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<strong><code>FALSE</code></strong>，但也可能返回等同于 <strong><code>FALSE</code></strong> 的非布尔值。请阅读 <a href="language.types.boolean.html" class="link">布尔类型</a>章节以获取更多信息。应使用
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<a href="language.operators.comparison.html" class="link">===
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运算符</a>来测试此函数的返回值。</p></div>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.array-search-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.3.0</td>
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<td>
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As with all internal PHP functions as of 5.3.0,
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<span class="function"><strong>array_search()</strong></span> returns <strong><code>NULL</code></strong> if invalid parameters
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are passed to it.
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.array-search-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-6064">
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<p><strong>Example #1 <span class="function"><strong>array_search()</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 />$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>
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</span>
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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.array-search-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_keys.html" class="function" rel="rdfs-seeAlso">array_keys()</a> - 返回数组中部分的或所有的键名</span></li>
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<li class="member"><span class="function"><a href="array_values.html" class="function" rel="rdfs-seeAlso">array_values()</a> - 返回数组中所有的值</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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<li class="member"><span class="function"><a href="in_array.html" class="function" rel="rdfs-seeAlso">in_array()</a> - 检查数组中是否存在某个值</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> |