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

### 说明

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

> 注意: 此方法需要 将 php.ini 中的 `phar.readonly` 设为 `0` 以适合 Phar 对象. 否则, 将抛出PharException.

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`.

### 参数

`algo`

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

### 返回值

没有返回值。

### 错误／异常

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.

### 更新日志

版本 | 说明
--- | ---
8.0.0 | `privateKey` is now nullable.

### 参见

- 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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