Generates an SHA-256 message digest

# Gmagick::getimagesignature

(PECL gmagick >= Unknown)

Gmagick::getimagesignature — Generates an SHA-256 message digest

### 说明

public function Gmagick::getimagesignature(): string

Generates an SHA-256 message digest for the image pixel stream.

### 参数

此函数没有参数。

### 返回值

Returns a string containing the SHA-256 hash of the file.

### 错误／异常

错误时抛出 GmagickException。

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