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173 lines
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HTML
173 lines
7.1 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>Create a gzip compressed string</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.gzencode" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gzencode</h1>
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<p class="verinfo">(PHP 4 >= 4.0.4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gzencode</span> — <span class="dc-title">Create a gzip compressed string</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gzencode-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>gzencode</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$level</code><span class="initializer"> = -1</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$encoding_mode</code><span class="initializer"> = FORCE_GZIP</span></span>
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]] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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This function returns a compressed version of the input
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<code class="parameter">data</code> compatible with the output of the
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<strong class="command">gzip</strong> program.
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</p>
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<p class="para">
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For more information on the GZIP file format, see the document:
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<a href="http://www.faqs.org/rfcs/rfc1952" class="link external">» GZIP file format specification
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version 4.3</a> (RFC 1952).
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gzencode-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">data</code></dt>
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<dd>
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<p class="para">
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The data to encode.
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</p>
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</dd>
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<dt>
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<code class="parameter">level</code></dt>
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<dd>
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<p class="para">
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The level of compression. Can be given as 0 for no compression up to 9
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for maximum compression. If not given, the default compression level will
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be the default compression level of the zlib library.
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</p>
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</dd>
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<dt>
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<code class="parameter">encoding_mode</code></dt>
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<dd>
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<p class="para">
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The encoding mode. Can be <strong><code>FORCE_GZIP</code></strong> (the default)
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or <strong><code>FORCE_DEFLATE</code></strong>.
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</p>
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<p class="para">
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Prior to PHP 5.4.0, using <strong><code>FORCE_DEFLATE</code></strong> results in
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a standard zlib deflated string (inclusive zlib headers) after a gzip
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file header but without the trailing crc32 checksum.
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</p>
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<p class="para">
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In PHP 5.4.0 and later, <strong><code>FORCE_DEFLATE</code></strong> generates
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RFC 1950 compliant output, consisting of a zlib header, the deflated
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data, and an Adler checksum.
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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.gzencode-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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The encoded string, or <strong><code>FALSE</code></strong> if an error occurred.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.gzencode-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>5.4.0</td>
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<td>
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<strong><code>FORCE_DEFLATE</code></strong> now generates RFC 1950 compliant
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output.
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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.gzencode-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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The resulting data contains the appropriate headers and data
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structure to make a standard .gz file, e.g.:
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<div class="example" id="example-871">
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<p><strong>Example #1 Creating a gzip file</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: #0000BB">implode</span><span style="color: #007700">(</span><span style="color: #DD0000">""</span><span style="color: #007700">, </span><span style="color: #0000BB">file</span><span style="color: #007700">(</span><span style="color: #DD0000">"bigfile.txt"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">$gzdata </span><span style="color: #007700">= </span><span style="color: #0000BB">gzencode</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">9</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"bigfile.txt.gz"</span><span style="color: #007700">, </span><span style="color: #DD0000">"w"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">$gzdata</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</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.gzencode-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="gzdecode.html" class="function" rel="rdfs-seeAlso">gzdecode()</a> - Decodes a gzip compressed string</span></li>
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<li class="member"><span class="function"><a href="gzdeflate.html" class="function" rel="rdfs-seeAlso">gzdeflate()</a> - Deflate a string</span></li>
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<li class="member"><span class="function"><a href="gzinflate.html" class="function" rel="rdfs-seeAlso">gzinflate()</a> - Inflate a deflated string</span></li>
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<li class="member"><span class="function"><a href="gzuncompress.html" class="function" rel="rdfs-seeAlso">gzuncompress()</a> - Uncompress a compressed string</span></li>
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<li class="member"><span class="function"><a href="gzcompress.html" class="function" rel="rdfs-seeAlso">gzcompress()</a> - Compress a string</span></li>
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<li class="member">
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<a href="http://www.faqs.org/rfcs/rfc1950" class="link external">»
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ZLIB Compressed Data Format Specification (RFC 1950)
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</a>
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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></div></div></body></html> |