(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL phar >= 1.0.0)
Phar::getSignature — Return MD5/SHA1/SHA256/SHA512/OpenSSL signature of a Phar archive
Returns the verification signature of a phar archive in a hexadecimal string.
   Array with the opened archive's signature in hash key and MD5,
   SHA-1,
   SHA-256, SHA-512, or OpenSSL
   in hash_type.  This signature is a hash calculated on the
   entire phar's contents, and may be used to verify the integrity of the archive.
   A valid signature is absolutely required of all executable phar archives if the
   phar.require_hash INI variable
   is set to true.
   If there is no signature, the function returns false.