function.gzencode.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Create a gzip compressed string</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.gzdeflate.html">gzdeflate</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.gzeof.html">gzeof</a></div> <div class="up"><a href="ref.zlib.html">Zlib Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.gzencode" class="refentry"> <div class="refnamediv"> <h1 class="refname">gzencode</h1> <p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">gzencode</span> — <span class="dc-title">Create a gzip compressed string</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>gzencode</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$data</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$level</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$encoding_mode</tt></span> ]] )</div> <p class="para rdfs-comment"> This function returns a compressed version of the input <i><tt class="parameter">data</tt></i> compatible with the output of the <strong class="command">gzip</strong> program. </p> <p class="para"> For more information on the GZIP file format, see the document: <a href="http://www.faqs.org/rfcs/rfc1952" class="link external">» GZIP file format specification version 4.3</a> (RFC 1952). </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">data</tt></i></span> <dd> <p class="para"> The data to encode. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">level</tt></i></span> <dd> <p class="para"> The level of compression. Can be given as 0 for no compression up to 9 for maximum compression. If not given, the default compression level will be the default compression level of the zlib library. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">encoding_mode</tt></i></span> <dd> <p class="para"> The encoding mode. Can be <b><tt>FORCE_GZIP</tt></b> (the default) or <b><tt>FORCE_DEFLATE</tt></b>. </p> <p class="para"> If you use <b><tt>FORCE_DEFLATE</tt></b>, you get a standard zlib deflated string (inclusive zlib headers) after the gzip file header but without the trailing crc32 checksum. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> The encoded string, or <b><tt>FALSE</tt></b> if an error occurred. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.2.0</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">encoding_mode</tt></i> parameter was added </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> The resulting data contains the appropriate headers and data structure to make a standard .gz file, e.g.: <div class="example"> <p><b>Example #1 Creating a gzip file</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.gzdecode.html" class="function" rel="rdfs-seeAlso">gzdecode()</a></li> <li class="member"><a href="function.gzdeflate.html" class="function" rel="rdfs-seeAlso">gzdeflate()</a></li> <li class="member"><a href="function.gzinflate.html" class="function" rel="rdfs-seeAlso">gzinflate()</a></li> <li class="member"><a href="function.gzuncompress.html" class="function" rel="rdfs-seeAlso">gzuncompress()</a></li> <li class="member"><a href="function.gzcompress.html" class="function" rel="rdfs-seeAlso">gzcompress()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.gzdeflate.html">gzdeflate</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.gzeof.html">gzeof</a></div> <div class="up"><a href="ref.zlib.html">Zlib Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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