PHP Australia Conference 2015

Phar::startBuffering

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

Phar::startBufferingStart buffering Phar write operations, do not modify the Phar object on disk

Descrierea

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.

Valorile întoarse

Nu este întoarsă nici o valoare.

Exemple

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();
?>

Vedeți de asemenea

  • 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

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