# Phar::canCompress

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

Phar::canCompress — Returns whether phar extension supports compression using either zlib or bzip2

### 说明

final public static Phar::canCompress(int `$compression` = 0): bool

This should be used to test whether compression is possible prior to loading a phar archive containing compressed files.

### 参数

`compression`

  Either `Phar::GZ` or `Phar::BZ2` can be used to test whether compression is possible with a specific compression algorithm (zlib or bzip2).

### 返回值

`true` if compression/decompression is available, `false` if not.

### 示例

示例 #1 A Phar::canCompress() example

`<?php
if (Phar::canCompress()) {
echo file_get_contents('phar://compressedphar.phar/internal/file.txt');
} else {
echo 'no compression available';
}
?>`

### 参见

- PharFileInfo::getCompressedSize() - Returns the actual size of the file (with compression) inside the Phar archive
- PharFileInfo::isCompressed() - Returns whether the entry is compressed
- PharFileInfo::compress() - Compresses the current Phar entry with either zlib or bzip2 compression
- PharFileInfo::decompress() - Decompresses the current Phar entry within the phar
- Phar::isCompressed() - Returns Phar::GZ or PHAR::BZ2 if the entire phar archive is compressed (.tar.gz/tar.bz and so on)
- Phar::compressFiles() - Compresses all files in the current Phar archive
- Phar::decompressFiles() - Decompresses all files in the current Phar archive
- Phar::getSupportedCompression() - Return array of supported compression algorithms
- Phar::convertToExecutable() - Convert a phar archive to another executable phar archive file format
- Phar::convertToData() - Convert a phar archive to a non-executable tar or zip file

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open