ZipArchive::setCompressionName

(PHP 7, PHP 8, PECL zip >= 1.13.0)

ZipArchive::setCompressionName — Définit la méthode de compression d'une entrée définit par son nom

Description

public ZipArchive::setCompressionName(string $name, int $method, int $compflags = 0): bool

Définit la méthode de compression d'une entrée définit par son nom.

Liste de paramètres

name: Nom de l'entrée.
method: La méthode de compression, une des constantes ZipArchive::CM_*.
compflags: Niveau de compression.

Valeurs de retour

Cette fonction retourne true en cas de succès ou false si une erreur survient.

Exemples

Exemple #1 Ajoute des fichiers avec différentes méthodes de compression dans une archive

<?php
$zip = new ZipArchive;
$res = $zip->open('test.zip', ZipArchive::CREATE);
if ($res === TRUE) {
    $zip->addFromString('foo', 'Some text');
    $zip->addFromString('bar', 'Some other text');
    $zip->setCompressionName('foo', ZipArchive::CM_STORE);
    $zip->setCompressionName('bar', ZipArchive::CM_DEFLATE);
    $zip->close();
    echo 'ok';
} else {
    echo 'échoué';
}
?>

Exemple #2 Ajoute un fichier et définir la méthode de compression

<?php
$zip = new ZipArchive;
$res = $zip->open('test.zip', ZipArchive::CREATE);
if ($res === TRUE) {
    $zip->addFile('foo.jpg', 'bar.jpg');
    $zip->setCompressionName('bar.jpg', ZipArchive::CM_XZ);
    $zip->close();
    echo 'ok';
} else {
    echo 'failed';
}
?>

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User Contributed Notes 1 note

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gajowy at agzeta dot pl ¶

1 year ago

The compression level (compflags) option is, generally speaking, an integer value between 0 and 9. The behavior of the system depends on the selected method and the value of compflags and can sometimes be not you expected.

The result below is from PHP 8.1 on Windows platform and may possibly be different on other systems or versions:

- for the CM_DEFAULT method, always CM_DEFLATE is used with level 9, regardless of what you put as compflags,

- for the CM_STORE method, for compflags 0-9 you get the same result, which is obvious because the method itself means "no compression at all". However, for compflags>9, surprisingly the CM_DEFLATE method is used instead with compression level 9.

- for CM_DEFLATE method, 1 means the fastest and weakest compression, while 9 - the slowest and strongest one. compflags=0 and compflags>9 works as it if were with compflags=9,

- for CM_BZIP2 method, 1 means the fastest and weakest compression, while 9 - the slowest and strongest one. compflags=0 works like compflag=9, and if you use compflags>9, the method will surprisingly switch to CM_DEFLATE level 9,

- for CM_XZ method, 0 means the fastest and weakest compression, while 9 - the slowest and strongest one. For compflags>9 the method surprisingly switch to CM_DEFLATE level 9.

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