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108 lines
4.1 KiB
HTML
108 lines
4.1 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>把一个字符串压缩成 bzip2 编码数据</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.bzcompress" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">bzcompress</h1>
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<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">bzcompress</span> — <span class="dc-title">把一个字符串压缩成 bzip2 编码数据</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.bzcompress-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>bzcompress</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$source</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$blocksize</code><span class="initializer"> = 4</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$workfactor</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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<span class="function"><strong>bzcompress()</strong></span> 压缩了指定的字符串并以 bzip2 编码返回数据。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.bzcompress-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">source</code></dt>
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<dd>
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<p class="para">
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待压缩的字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">blocksize</code></dt>
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<dd>
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<p class="para">
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指定压缩时使用的块大小，应该是一个 1-9 的数字。9 可以有最高的压缩比，但会使用更多的资源。
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</p>
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</dd>
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<dt>
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<code class="parameter">workfactor</code></dt>
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<dd>
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<p class="para">
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控制压缩阶段出现最坏的重复性高的情况下输入数据时的行为。
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该值可以是在 0 至 250 之间，0是一个特殊的情况。
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</p>
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<p class="para">
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无论 <code class="parameter">workfactor</code>是什么，产生的输出都是一致的。
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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.bzcompress-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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压缩后的字符串，或者在出现错误时返回错误号。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.bzcompress-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-696">
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<p><strong>Example #1 压缩数据</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">"sample data"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$bzstr </span><span style="color: #007700">= </span><span style="color: #0000BB">bzcompress</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">9</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$bzstr</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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</div>
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<div class="refsect1 seealso" id="refsect1-function.bzcompress-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="bzdecompress.html" class="function" rel="rdfs-seeAlso">bzdecompress()</a> - 解压经 bzip2 编码过的数据</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> |