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This document uses PHP Chinese website manual Release
(PHP >= 5.3.0, PECL phar >= 1.0.0)
Phar::startBuffering — Start buffering Phar write operations, do not modify the Phar object on disk
Although technically unnecessary, the Phar::startBuffering() 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.
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 Phar::startBuffering() / Phar::stopBuffering() pair of methods is provided for this purpose.
Phar write buffering is per-archive, buffering active for the foo.phar Phar archive does not affect changes to the bar.phar Phar archive.
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Example #1 A Phar::startBuffering() example
<?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 ();
?>