Phar::canCompress()

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

Returns whether phar extension supports compression using either zlib or bzip2

说明

finalpublicstaticPhar::canCompress([int $type= 0]): bool

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

参数

$type

EitherPhar::GZorPhar::BZ2can 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.

范例

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