(PECL ps >= 1.1.0)
ps_open_image_file — Opens image from file
$psdoc
   , string $type
   , string $filename
   [, string $stringparam
   [, int $intparam = 0
  ]] )Loads an image for later use.
psdoc
     Resource identifier of the postscript file as returned by ps_new().
type
     The type of the image. Possible values are png, jpeg, or eps.
filename
     The name of the file containing the image data.
stringparam
     Not used.
intparam
     Not used.
Returns identifier of image or zero in case of an error. The identifier is a positive number greater than 0.