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This document uses PHP Chinese website manual Release
(PECL gmagick >= Unknown)
Gmagick::haspreviousimage — Checks if the object has a previous image
Returns TRUE if the object has more images when traversing the list in the reverse direction
此函数没有参数。
Returns TRUE if the object has more images when traversing the list in the reverse direction, returns FALSE if there are none.
错误时抛出 GmagickException。