# Phar::setSignatureAlgorithm

(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 1.1.0)

Phar::setSignatureAlgorithm — Set the signature algorithm for a phar and apply it

### Description

public Phar::setSignatureAlgorithm ( int `$sigtype` ) : void

> Note:

> This method requires the php.ini setting `phar.readonly` to be set to `0` in order to work for Phar objects. Otherwise, a PharException will be thrown.

Set the signature algorithm for a phar and apply it. The signature algorithm must be one of `Phar::MD5`, `Phar::SHA1`, `Phar::SHA256`, `Phar::SHA512`, or `Phar::PGP` (pgp not yet supported and falls back to SHA-1).

### Parameters

`sigtype`

  One of `Phar::MD5`, `Phar::SHA1`, `Phar::SHA256`, `Phar::SHA512`, or `Phar::PGP`

### Return Values

No value is returned.

### Errors/Exceptions

Throws UnexpectedValueException for many errors, BadMethodCallException if called for a zip- or a tar-based phar archive, and a PharException if any problems occur flushing changes to disk.

### See Also

- Phar::getSupportedSignatures() - Return array of supported signature types
- Phar::getSignature() - Return MD5/SHA1/SHA256/SHA512/OpenSSL signature of a Phar archive