List of PHP image handling functions

FUNCTION LIBRARY DESCRIPTION
exif_imagetype() none (exif) Returns an image's format.
exif_read_data() none (exif) Returns an image's metadata.
getimagesize() none (exif) Returns an image's size
imagecreatefromjpeg() none (exif) Creates an image of a JPEG type.
imagecopyresized() none (exif) Resizes an image.