预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

**Phar compression constants**
Constant	Value	Description
`Phar::NONE` (int)	0x00000000	no compression
`Phar::COMPRESSED` (int)	0x0000F000	bitmask that can be used with file flags to determine if any compression is present
`Phar::GZ` (int)	0x00001000	zlib (gzip) compression
`Phar::BZ2` (int)	0x00002000	bzip2 compression

**Phar signature constants**
Constant	Value	Description
`Phar::MD5` (int)	0x0001	signature with md5 hash algorithm
`Phar::SHA1` (int)	0x0002	signature with sha1 hash algorithm
`Phar::SHA256` (int)	0x0003	signature with sha256 hash algorithm (requires hash extension)
`Phar::SHA512` (int)	0x0004	signature with sha512 hash algorithm (requires hash extension)
`Phar::OPENSSL` (int)	0x0010	signature with OpenSSL public/private key pair. This is a true, asymmetric key signature.

**Phar webPhar mime override constants**
Constant	Value	Description
`Phar::PHP` (int)	0	used to instruct the mimeoverrides parameter of Phar::webPhar() that the extension should be parsed as a PHP file
`Phar::PHPS` (int)	1	used to instruct the mimeoverrides parameter of Phar::webPhar() that the extension should be parsed as a PHP source file through highlight_file()

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