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168 lines
8.1 KiB
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<!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>计算字串出现的次数</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.substr-count" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">substr_count</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">substr_count</span> — <span class="dc-title">计算字串出现的次数</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.substr-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>substr_count</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$haystack</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$needle</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</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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<span class="function"><strong>substr_count()</strong></span> 返回子字符串<code class="parameter">needle</code> 在字符串 <code class="parameter">haystack</code> 中出现的次数。注意 <code class="parameter">needle</code> 区分大小写。
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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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该函数不会计算重叠字符串。参见下面的例子。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.substr-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">haystack</code></dt>
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<dd>
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<p class="para">
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在此字符串中进行搜索。
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</p>
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</dd>
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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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要搜索的字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">offset</code></dt>
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<dd>
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<p class="para">
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开始计数的偏移位置。如果是负数，就从字符的末尾开始统计。
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</p>
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</dd>
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<dt>
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<code class="parameter">length</code></dt>
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<dd>
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<p class="para">
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指定偏移位置之后的最大搜索长度。如果偏移量加上这个长度的和大于 <code class="parameter">haystack</code> 的总长度，则打印警告信息。
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负数的长度 length 是从 <code class="parameter">haystack</code> 的末尾开始统计的。
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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.substr-count-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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该函数返回<span class="type"><span class="type 整型">整型</span></span>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.substr-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>7.1.0</td>
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<td>
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开始支持负数的 <code class="parameter">offset</code> 和 <code class="parameter">length</code>。
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</td>
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</tr>
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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">offset</code> 和 <code class="parameter">length</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.substr-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-5992">
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<p><strong>Example #1 <span class="function"><strong>substr_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 />$text </span><span style="color: #007700">= </span><span style="color: #DD0000">'This is a test'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">); </span><span style="color: #FF8000">// 14<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 2<br /><br />// 字符串被简化为 's is a test'，因此输出 1<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 字符串被简化为 's i'，所以输出 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 因为 5+10 > 14，所以生成警告<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'is'</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /><br /><br /></span><span style="color: #FF8000">// 输出 1，因为该函数不计算重叠字符串<br /></span><span style="color: #0000BB">$text2 </span><span style="color: #007700">= </span><span style="color: #DD0000">'gcdgcdgcd'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">substr_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$text2</span><span style="color: #007700">, </span><span style="color: #DD0000">'gcdgcd'</span><span style="color: #007700">);<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.substr-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="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="strpos.html" class="function" rel="rdfs-seeAlso">strpos()</a> - 查找字符串首次出现的位置</span></li>
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<li class="member"><span class="function"><a href="substr.html" class="function" rel="rdfs-seeAlso">substr()</a> - 返回字符串的子串</span></li>
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<li class="member"><span class="function"><a href="strstr.html" class="function" rel="rdfs-seeAlso">strstr()</a> - 查找字符串的首次出现</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> |