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(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.
У цієї функції немає параметрів.
Returns true if the object has more images when traversing the list in the reverse direction, returns false if there are none.
Викидає GmagickException у разі помилки.