Php/docs/phar.startbuffering
Phar::startBuffering
(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 1.0.0)
Phar::startBuffering — Start buffering Phar write operations, do not modify the Phar object on disk
说明
public 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("<?phpfunction __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
