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(PECL imagick 2, PECL imagick 3)
Imagick::__toString — Returns the image as a string
Returns the current image as string. This will only return a single image; it should not be used for Imagick objects that contain multiple images e.g. an animated GIF or PDF with multiple pages.
此函数没有参数。
Returns the string content on success or an empty string on failure.
