ZipArchive::setCompressionName

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

ZipArchive::setCompressionName — Установить метод сжатия записи, заданной по имени

Описание

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

Устанавливает метод сжатия записи заданной по имени.

Список параметров

name: Имя записи.
method: Метод сжатия, одна из констант ZipArchive::CM_*.
compflags: Уровень сжатия.

Возвращаемые значения

Функция возвращает true в случае успешного выполнения или false, если возникла ошибка.

Примеры

Пример #1 Добавить к архиву файлы с разными методами сжатия

<?php
$zip = new ZipArchive;
$res = $zip->open('test.zip', ZipArchive::CREATE);
if ($res === TRUE) {
    $zip->addFromString('foo', 'Некоторый текст');
    $zip->addFromString('bar', 'Некоторый другой текст');
    $zip->setCompressionName('foo', ZipArchive::CM_STORE);
    $zip->setCompressionName('bar', ZipArchive::CM_DEFLATE);
    $zip->close();
    echo 'готово';
} else {
    echo 'ошибка';
}
?>

Пример #2 Добавить файл и установить метод сжатия

<?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 'готово';
} else {
    echo 'ошибка';
}
?>

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Инструкция • Исправление • Сообщение об ошибке

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Примечания пользователей 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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