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143 lines
5.9 KiB
HTML
143 lines
5.9 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>返回字符串所用字符的信息</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.count-chars" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">count_chars</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">count_chars</span> — <span class="dc-title">返回字符串所用字符的信息</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.count-chars-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>count_chars</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code><span class="initializer"> = 0</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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统计 <code class="parameter">string</code>
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中每个字节值（0..255）出现的次数，使用多种模式返回结果。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.count-chars-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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需要统计的字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para">
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参见返回的值。
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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.count-chars-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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根据不同的 <code class="parameter">mode</code>，<span class="function"><strong>count_chars()</strong></span>
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返回下列不同的结果：
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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 - 以所有的每个字节值作为键名，出现次数作为值的数组。
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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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1 - 与 0 相同，但只列出出现次数大于零的字节值。
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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 - 与 0 相同，但只列出出现次数等于零的字节值。
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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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3 - 返回由所有使用了的字节值组成的字符串。
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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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4 - 返回由所有未使用的字节值组成的字符串。
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</span>
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</li>
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</ul>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.count-chars-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-5897">
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<p><strong>Example #1 <span class="function"><strong>count_chars()</strong></span> 示例</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 />$data </span><span style="color: #007700">= </span><span style="color: #DD0000">"Two Ts and one F."</span><span style="color: #007700">;<br /><br />foreach (</span><span style="color: #0000BB">count_chars</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">) as </span><span style="color: #0000BB">$i </span><span style="color: #007700">=> </span><span style="color: #0000BB">$val</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"There were </span><span style="color: #0000BB">$val</span><span style="color: #DD0000"> instance(s) of \"" </span><span style="color: #007700">, </span><span style="color: #0000BB">chr</span><span style="color: #007700">(</span><span style="color: #0000BB">$i</span><span style="color: #007700">) , </span><span style="color: #DD0000">"\" in the string.\n"</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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There were 4 instance(s) of " " in the string.
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There were 1 instance(s) of "." in the string.
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There were 1 instance(s) of "F" in the string.
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There were 2 instance(s) of "T" in the string.
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There were 1 instance(s) of "a" in the string.
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There were 1 instance(s) of "d" in the string.
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There were 1 instance(s) of "e" in the string.
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There were 2 instance(s) of "n" in the string.
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There were 2 instance(s) of "o" in the string.
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There were 1 instance(s) of "s" in the string.
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There were 1 instance(s) of "w" in the string.
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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.count-chars-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="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_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> |