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201 lines
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HTML
201 lines
8.1 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>返回字符串中单词的使用情况</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.str-word-count" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">str_word_count</h1>
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<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">str_word_count</span> — <span class="dc-title">返回字符串中单词的使用情况</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.str-word-count-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>str_word_count</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$format</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$charlist</code></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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统计 <code class="parameter">string</code> 中单词的数量。如果可选的参数 <code class="parameter">format</code> 没有被指定，那么返回值是一个代表单词数量的整型数。如果指定了 <code class="parameter">format</code> 参数，返回值将是一个数组，数组的内容则取决于 <code class="parameter">format</code> 参数。<code class="parameter">format</code> 的可能值和相应的输出结果如下所列。
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</p>
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<p class="para">
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对于这个函数的目的来说，单词的定义是一个与区域设置相关的字符串。这个字符串可以包含字母字符，也可以包含 "'" 和 "-" 字符（但不能以这两个字符开始）。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.str-word-count-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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字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">format</code></dt>
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<dd>
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<p class="para">
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指定函数的返回值。当前支持的值如下：
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">
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0 - 返回单词数量
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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1 - 返回一个包含 <code class="parameter">string</code> 中全部单词的数组
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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2 - 返回关联数组。数组的键是单词在 <code class="parameter">string</code> 中出现的数值位置，数组的值是这个单词
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</span>
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</li>
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</ul>
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</p>
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</dd>
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<dt>
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<code class="parameter">charlist</code></dt>
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<dd>
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<p class="para">
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附加的字符串列表，其中的字符将被视为单词的一部分。
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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.str-word-count-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回一个数组或整型数，这取决于 <code class="parameter">format</code> 参数的选择。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.str-word-count-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>5.1.0</td>
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<td>
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新增 <code class="parameter">charlist</code> 参数。
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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.str-word-count-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-5961">
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<p><strong>Example #1 <span class="function"><strong>str_word_count()</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 /><br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">"Hello fri3nd, you're<br /> looking good today!"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">'àáãç3'</span><span style="color: #007700">));<br /><br />echo </span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</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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Array
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(
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[0] => Hello
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[1] => fri
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[2] => nd
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[3] => you're
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[4] => looking
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[5] => good
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[6] => today
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)
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Array
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(
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[0] => Hello
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[6] => fri
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[10] => nd
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[14] => you're
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[29] => looking
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[46] => good
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[51] => today
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)
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Array
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(
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[0] => Hello
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[1] => fri3nd
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[2] => you're
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[3] => looking
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[4] => good
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[5] => today
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)
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7
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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.str-word-count-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="explode.html" class="function" rel="rdfs-seeAlso">explode()</a> - 使用一个字符串分割另一个字符串</span></li>
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<li class="member"><span class="function"><a href="preg_split.html" class="function" rel="rdfs-seeAlso">preg_split()</a> - 通过一个正则表达式分隔字符串</span></li>
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<li class="member"><span class="function"><a href="split.html" class="function" rel="rdfs-seeAlso">split()</a> - 用正则表达式将字符串分割到数组中</span></li>
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<li class="member"><span class="function"><a href="count_chars.html" class="function" rel="rdfs-seeAlso">count_chars()</a> - 返回字符串所用字符的信息</span></li>
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<li class="member"><span class="function"><a href="substr_count.html" class="function" rel="rdfs-seeAlso">substr_count()</a> - 计算字串出现的次数</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> |