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128 lines
3.5 KiB
HTML
128 lines
3.5 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>返回字符串的宽度</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.mb-strwidth" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mb_strwidth</h1>
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<p class="verinfo">(PHP 4 >= 4.0.6, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">mb_strwidth</span> — <span class="dc-title">返回字符串的宽度</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mb-strwidth-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>mb_strwidth</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$encoding</code><span class="initializer"> = mb_internal_encoding()</span></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 <span class="type"><a href="language.types.string.html" class="type string">string</a></span> 类型 <code class="parameter">str</code> 的宽度。
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</p>
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<p class="para">
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多字节字符通常是单字节字符的两倍宽度。
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</p>
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<p class="para">
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<table class="doctable table">
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<caption><strong>字符宽度</strong></caption>
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<thead>
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<tr>
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<th>字符</th>
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<th>宽度</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>U+0000 - U+0019</td>
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<td>0</td>
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</tr>
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<tr>
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<td>U+0020 - U+1FFF</td>
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<td>1</td>
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</tr>
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<tr>
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<td>U+2000 - U+FF60</td>
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<td>2</td>
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</tr>
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<tr>
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<td>U+FF61 - U+FF9F</td>
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<td>1</td>
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</tr>
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<tr>
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<td>U+FFA0 - </td>
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<td>2</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 parameters" id="refsect1-function.mb-strwidth-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">str</code></dt>
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<dd>
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<p class="para">
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待解码的 <span class="type"><a href="language.types.string.html" class="type string">string</a></span>。
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</p>
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</dd>
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<dt>
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<code class="parameter">encoding</code></dt>
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<dd>
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<p class="para"><code class="parameter">encoding</code>
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参数为字符编码。如果省略，则使用内部字符编码。</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.mb-strwidth-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<span class="type"><a href="language.types.string.html" class="type string">string</a></span> <code class="parameter">str</code> 的宽度。
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mb-strwidth-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="mb_strimwidth.html" class="function" rel="rdfs-seeAlso">mb_strimwidth()</a> - 获取按指定宽度截断的字符串</span></li>
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<li class="member"><span class="function"><a href="mb_internal_encoding.html" class="function" rel="rdfs-seeAlso">mb_internal_encoding()</a> - 设置/获取内部字符编码</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> |