Phar::startBuffering

    (PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL phar >= 1.0.0)

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

    Description

    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.

    Parameters

    This function has no parameters.

    Return Values

    No value is returned.

    Examples

    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();
    ?>

    See Also

    • 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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    User Contributed Notes 1 note

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    anon at php dot com
    3 years ago
    To setthe ini key phar.readonly to 0, from a unix shell script, this is possible on the fly it is possible see below.
    The example given on this page has some issues with quoting: (See conversion to simple quotes)

    #!/usr/bin/php -d phar.readonly=0
    <?php
    print(ini_get('phar.readonly')); // Must return 0
    // 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']->compress(Phar::GZ);
    $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();

    // Test
    $m = file_get_contents("phar://brandnewphar.phar/file2.txt");
    $m = explode("\n",$m);
    var_dump($m);
    /* Output:
    * there
    **/
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