Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

GD_VERSION (string): The GD version PHP was compiled against. (Available as of PHP 5.2.4)
GD_MAJOR_VERSION (integer): The GD major version PHP was compiled against. (Available as of PHP 5.2.4)
GD_MINOR_VERSION (integer): The GD minor version PHP was compiled against. (Available as of PHP 5.2.4)
GD_RELEASE_VERSION (integer): The GD release version PHP was compiled against. (Available as of PHP 5.2.4)
GD_EXTRA_VERSION (string): The GD "extra" version (beta/rc..) PHP was compiled against. (Available as of PHP 5.2.4)
IMG_GIF (integer): Used as a return value by imagetypes()
IMG_JPG (integer): Used as a return value by imagetypes()
IMG_JPEG (integer): Used as a return value by imagetypes()
Note: This constant has the same value as IMAGE_JPG
IMG_PNG (integer): Used as a return value by imagetypes()
IMG_WBMP (integer): Used as a return value by imagetypes()
IMG_XPM (integer): Used as a return value by imagetypes()
IMG_COLOR_TILED (integer): Special color option which can be used in stead of color allocated with imagecolorallocate() or imagecolorallocatealpha()
IMG_COLOR_STYLED (integer): Special color option which can be used in stead of color allocated with imagecolorallocate() or imagecolorallocatealpha()
IMG_COLOR_BRUSHED (integer): Special color option which can be used in stead of color allocated with imagecolorallocate() or imagecolorallocatealpha()
IMG_COLOR_STYLEDBRUSHED (integer): Special color option which can be used in stead of color allocated with imagecolorallocate() or imagecolorallocatealpha()
IMG_COLOR_TRANSPARENT (integer): Special color option which can be used in stead of color allocated with imagecolorallocate() or imagecolorallocatealpha()
IMG_ARC_ROUNDED (integer): A style constant used by the imagefilledarc() function.
Note: This constant has the same value as IMG_ARC_PIE
IMG_ARC_PIE (integer): A style constant used by the imagefilledarc() function.
IMG_ARC_CHORD (integer): A style constant used by the imagefilledarc() function.
IMG_ARC_NOFILL (integer): A style constant used by the imagefilledarc() function.
IMG_ARC_EDGED (integer): A style constant used by the imagefilledarc() function.
IMG_GD2_RAW (integer): A type constant used by the imagegd2() function.
IMG_GD2_COMPRESSED (integer): A type constant used by the imagegd2() function.
IMG_EFFECT_REPLACE (integer): Alpha blending effect used by the imagelayereffect() function.
IMG_EFFECT_ALPHABLEND (integer): Alpha blending effect used by the imagelayereffect() function.
IMG_EFFECT_NORMAL (integer): Alpha blending effect used by the imagelayereffect() function.
IMG_EFFECT_OVERLAY (integer): Alpha blending effect used by the imagelayereffect() function.
IMG_FILTER_NEGATE (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_GRAYSCALE (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_BRIGHTNESS (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_CONTRAST (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_COLORIZE (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_EDGEDETECT (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_GAUSSIAN_BLUR (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_SELECTIVE_BLUR (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_EMBOSS (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_MEAN_REMOVAL (integer): Special GD filter used by the imagefilter() function.
IMG_FILTER_SMOOTH (integer): Special GD filter used by the imagefilter() function.
IMAGETYPE_GIF (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JPEG (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_PNG (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_SWF (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_PSD (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_BMP (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_WBMP (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_XBM (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_TIFF_II (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_TIFF_MM (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_IFF (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JB2 (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JPC (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JP2 (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JPX (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_SWC (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_ICO (integer): Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions. (Available as of PHP 5.3.0)
PNG_NO_FILTER (integer): A special PNG filter, used by the imagepng() function.
PNG_FILTER_NONE (integer): A special PNG filter, used by the imagepng() function.
PNG_FILTER_SUB (integer): A special PNG filter, used by the imagepng() function.
PNG_FILTER_UP (integer): A special PNG filter, used by the imagepng() function.
PNG_FILTER_AVG (integer): A special PNG filter, used by the imagepng() function.
PNG_FILTER_PAETH (integer): A special PNG filter, used by the imagepng() function.
PNG_ALL_FILTERS (integer): A special PNG filter, used by the imagepng() function.