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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="phar.startbuffering">
<refnamediv>
<refname>Phar::startBuffering</refname>
<refpurpose>Start buffering Phar write operations, do not modify the Phar object on disk</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>void</type><methodname>Phar::startBuffering</methodname>
<void/>
</methodsynopsis>
<para>
Although technically unnecessary, the <function>Phar::startBuffering</function> 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.
</para>
<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
<function>Phar::startBuffering</function>/<function>Phar::stopBuffering</function> pair
of methods is provided for this purpose.
</para>
<para>
Phar write buffering is per-archive, buffering active for the
<literal>foo.phar</literal> Phar archive does not affect changes
to the <literal>bar.phar</literal> Phar archive.
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.void;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>A <function>Phar::startBuffering</function> example</title>
<para>
</para>
<programlisting role="php">
<![CDATA[
<?php
// make sure it doesn't exist
@unlink('brandnewphar.phar');
try {
$p = new Phar(dirname(__FILE__) . '/brandnewphar.phar', 0, 'brandnewphar.phar');
} catch (Exception $e) {
echo 'Could not create phar:', $e;
}
echo 'The new phar has ' . $p->count() . " entries\n";
$p->startBuffering();
$p['file.txt'] = 'hi';
$p['file2.txt'] = 'there';
$p['file2.txt']->setCompressedGZ();
$p['file3.txt'] = 'babyface';
$p['file3.txt']->setMetaData(42);
$p->setStub("<?php
function __autoload($class)
{
include 'phar://myphar.phar/' . str_replace('_', '/', $class) . '.php';
}
Phar::mapPhar('myphar.phar');
include 'phar://myphar.phar/startup.php';
__HALT_COMPILER();");
$p->stopBuffering();
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>Phar::stopBuffering</function></member>
<member><function>Phar::isBuffering</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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