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This document uses PHP Chinese website manual Release
(PECL imagick 2.0.0)
Imagick::getImageIndex — Gets the index of the current active image
Returns the index of the current active image within the Imagick object. This method has been deprecated. See Imagick::getIteratorIndex() .
Returns an integer containing the index of the image in the stack.
错误时抛出 ImagickException。