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This extension defines the following resource types:

List of resource types in GD
Name Description Notes
gd Image resource, used by functions like imagecreatefrompng()  
gd font Font resource internally created by imageloadfont()  
gd PS font PostScript Type 1 font resource, returned by imagepsloadfont() Removed as of PHP 7.0.0.
gd PS encoding PostScript Type 1 encoding resource, returned by imagepsencodefont() Removed as of PHP 7.0.0.