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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>Start buffering Phar write operations, do not modify the Phar object on disk</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="phar.setstub.html">Phar::setStub</a></div> <div class="next" style="text-align: right; float: right;"><a href="phar.stopbuffering.html">Phar::stopBuffering</a></div> <div class="up"><a href="class.Phar.html">Phar</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="phar.startbuffering" class="refentry"> <div class="refnamediv"> <h1 class="refname">Phar::startBuffering</h1> <p class="verinfo">(PECL phar:1.0.0-1.2.1)</p><p class="refpurpose"><span class="refname">Phar::startBuffering</span> — <span class="dc-title">Start buffering Phar write operations, do not modify the Phar object on disk</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><span class="type void">void</span></span> <span class="methodname"><b><b>Phar::startBuffering</b></b></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment"> Although technically unnecessary, the <b>startBuffering()</b> method can provide a significant performance boost when creating or modifying a Phar archive with a large number of files. Ordinarily, every time a file within a Phar archive is created or modified in any way, the entire Phar archive will be recreated with the changes. In this way, the archive will be up-to-date with the activity performed on it. </p> <p class="para"> However, this can be unnecessary when simply creating a new Phar archive, when it would make more sense to write the entire archive out at once. Similarly, it is often necessary to make a series of changes and to ensure that they all are possible before making any changes on disk, similar to the relational database concept of transactions. the <b>startBuffering()</b>/<b>stopBuffering()</b> pair of methods is provided for this purpose. </p> <p class="para"> Phar write buffering is per-archive, buffering active for the <i>foo.phar</i> Phar archive does not affect changes to the <i>bar.phar</i> Phar archive. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 A <b>Phar::startBuffering()</b> example</b></p> <div class="example-contents"><p> </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// make sure it doesn't exist<br /></span><span style="color: #007700">@</span><span style="color: #0000BB">unlink</span><span style="color: #007700">(</span><span style="color: #DD0000">'brandnewphar.phar'</span><span style="color: #007700">);<br />try {<br /> </span><span style="color: #0000BB">$p </span><span style="color: #007700">= new </span><span style="color: #0000BB">Phar</span><span style="color: #007700">(</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">) . </span><span style="color: #DD0000">'/brandnewphar.phar'</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #DD0000">'brandnewphar.phar'</span><span style="color: #007700">);<br />} catch (</span><span style="color: #0000BB">Exception $e</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'Could not create phar:'</span><span style="color: #007700">, </span><span style="color: #0000BB">$e</span><span style="color: #007700">;<br />}<br />echo </span><span style="color: #DD0000">'The new phar has ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$p</span><span style="color: #007700">-></span><span style="color: #0000BB">count</span><span style="color: #007700">() . </span><span style="color: #DD0000">" entries\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">-></span><span style="color: #0000BB">startBuffering</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file.txt'</span><span style="color: #007700">] = </span><span style="color: #DD0000">'hi'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file2.txt'</span><span style="color: #007700">] = </span><span style="color: #DD0000">'there'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file2.txt'</span><span style="color: #007700">]-></span><span style="color: #0000BB">setCompressedGZ</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file3.txt'</span><span style="color: #007700">] = </span><span style="color: #DD0000">'babyface'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file3.txt'</span><span style="color: #007700">]-></span><span style="color: #0000BB">setMetaData</span><span style="color: #007700">(</span><span style="color: #0000BB">42</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">-></span><span style="color: #0000BB">setStub</span><span style="color: #007700">(</span><span style="color: #DD0000">"<?php<br />function __autoload($class)<br />{<br /> include 'phar://myphar.phar/' . str_replace('_', '/', $class) . '.php';<br />}<br />Phar::mapPhar('myphar.phar');<br />include 'phar://myphar.phar/startup.php';<br />__HALT_COMPILER();"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">-></span><span style="color: #0000BB">stopBuffering</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="phar.stopbuffering.html" class="function" rel="rdfs-seeAlso">Phar::stopBuffering()</a></li> <li class="member"><a href="phar.isbuffering.html" class="function" rel="rdfs-seeAlso">Phar::isBuffering()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="phar.setstub.html">Phar::setStub</a></div> <div class="next" style="text-align: right; float: right;"><a href="phar.stopbuffering.html">Phar::stopBuffering</a></div> <div class="up"><a href="class.Phar.html">Phar</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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