Phar::startBuffering

(PHP >= 5.3.0, PECL phar >= 1.0.0)

Phar::startBuffering — Start buffering Phar write operations, do not modify the Phar object on disk

说明

public void Phar::startBuffering ( void )

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.

返回值

没有返回值。

范例

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 ();
 ?>

参见

Phar::stopBuffering() - Stop buffering write requests to the Phar archive, and save changes to disk
Phar::isBuffering() - Used to determine whether Phar write operations are being buffered, or are flushing directly to disk