(PECL ps >= 1.1.0)
ps_close_image — Closes image and frees memory
Closes an image and frees its resources. Once an image is closed it cannot be used anymore.
psdoc
Resource identifier of the postscript file as returned by ps_new().
imageid
Resource identifier of the image as returned by ps_open_image() or ps_open_image_file().
Returns null
on success 或者在失败时返回 false
.