Set the signature algorithm for a phar and apply it

# PharData::setSignatureAlgorithm

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

### Description

public PharData::setSignatureAlgorithm(int `$algo`, ?string `$privateKey` = `null`): 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::OPENSSL`.

### Parameters

`algo`

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

### 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.

### Changelog

Version | Description
--- | ---
8.0.0 | `privateKey` is now nullable.

### See Also

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

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