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132 lines
4.9 KiB
HTML
132 lines
4.9 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>获取字符串长度</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.strlen" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">strlen</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">strlen</span> — <span class="dc-title">获取字符串长度</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.strlen-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>strlen</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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返回给定的字符串 <code class="parameter">string</code> 的长度。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.strlen-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">string</code></dt>
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<dd>
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<p class="para">
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需要计算长度的<span class="type"><span class="type 字符串">字符串</span></span>。
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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.strlen-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功则返回字符串 <code class="parameter">string</code> 的长度；如果 <code class="parameter">string</code> 为空，则返回 0。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.strlen-changelog">
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<h3 class="title">更新日志</h3>
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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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Prior versions treated arrays as the string <em>Array</em>, thus returning
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a string length of <em>5</em> and emitting an <strong><code>E_NOTICE</code></strong> level error.
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="refsect1 examples" id="refsect1-function.strlen-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-5972">
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<p><strong>Example #1 <span class="function"><strong>strlen()</strong></span> 范例</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 />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">'abcdef'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">); </span><span style="color: #FF8000">// 6<br /><br /></span><span style="color: #0000BB">$str </span><span style="color: #007700">= </span><span style="color: #DD0000">' ab cd '</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">); </span><span style="color: #FF8000">// 7<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 notes" id="refsect1-function.strlen-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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<span class="function"><strong>strlen()</strong></span> returns the number of bytes rather than the number
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of characters in a string.
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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<span class="function"><strong>strlen()</strong></span> returns <strong><code>NULL</code></strong> when executed on arrays, and
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an <strong><code>E_WARNING</code></strong> level error is emitted.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.strlen-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="count.html" class="function" rel="rdfs-seeAlso">count()</a> - 计算数组中的单元数目，或对象中的属性个数</span></li>
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<li class="member"><span class="function"><a href="mb_strlen.html" class="function" rel="rdfs-seeAlso">mb_strlen()</a> - 获取字符串的长度</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> |