PHP 8.3.4 Released!

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.
GD_MAJOR_VERSION (int)
The GD major version PHP was compiled against.
GD_MINOR_VERSION (int)
The GD minor version PHP was compiled against.
GD_RELEASE_VERSION (int)
The GD release version PHP was compiled against.
GD_EXTRA_VERSION (string)
The GD "extra" version (beta/rc..) PHP was compiled against.
GD_BUNDLED (int)
When the bundled version of GD is used this is 1 otherwise its set to 0.
IMG_AVIF (int)
Used as a return value by imagetypes() (Available as of PHP 8.1.0)
IMG_BMP (int)
Used as a return value by imagetypes()
IMG_GIF (int)
Used as a return value by imagetypes()
IMG_JPG (int)
Used as a return value by imagetypes()
IMG_JPEG (int)
Used as a return value by imagetypes()

Note:

This constant has the same value as IMG_JPG

IMG_PNG (int)
Used as a return value by imagetypes()
IMG_WBMP (int)
Used as a return value by imagetypes()
IMG_XPM (int)
Used as a return value by imagetypes()
IMG_WEBP (int)
Used as a return value by imagetypes() (Available as of PHP 7.0.10)
IMG_WEBP_LOSSLESS (int)
(Available as of PHP 8.1.0)
IMG_COLOR_TILED (int)
Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().
IMG_COLOR_STYLED (int)
Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().
IMG_COLOR_BRUSHED (int)
Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().
IMG_COLOR_STYLEDBRUSHED (int)
Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().
IMG_COLOR_TRANSPARENT (int)
Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().
IMG_AFFINE_TRANSLATE (int)
An affine transformation type constant used by the imageaffinematrixget() function.
IMG_AFFINE_SCALE (int)
An affine transformation type constant used by the imageaffinematrixget() function.
IMG_AFFINE_ROTATE (int)
An affine transformation type constant used by the imageaffinematrixget() function.
IMG_AFFINE_SHEAR_HORIZONTAL (int)
An affine transformation type constant used by the imageaffinematrixget() function.
IMG_AFFINE_SHEAR_VERTICAL (int)
An affine transformation type constant used by the imageaffinematrixget() function.
IMG_ARC_ROUNDED (int)
A style constant used by the imagefilledarc() function.

Note:

This constant has the same value as IMG_ARC_PIE

IMG_ARC_PIE (int)
A style constant used by the imagefilledarc() function.
IMG_ARC_CHORD (int)
A style constant used by the imagefilledarc() function.
IMG_ARC_NOFILL (int)
A style constant used by the imagefilledarc() function.
IMG_ARC_EDGED (int)
A style constant used by the imagefilledarc() function.
IMG_GD2_RAW (int)
A type constant used by the imagegd2() function.
IMG_GD2_COMPRESSED (int)
A type constant used by the imagegd2() function.
IMG_EFFECT_REPLACE (int)
Alpha blending effect used by the imagelayereffect() function.
IMG_EFFECT_ALPHABLEND (int)
Alpha blending effect used by the imagelayereffect() function.
IMG_EFFECT_NORMAL (int)
Alpha blending effect used by the imagelayereffect() function.
IMG_EFFECT_OVERLAY (int)
Alpha blending effect used by the imagelayereffect() function.
IMG_EFFECT_MULTIPLY (int)
Alpha blending effect used by the imagelayereffect() function.
IMG_FILTER_NEGATE (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_GRAYSCALE (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_BRIGHTNESS (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_CONTRAST (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_COLORIZE (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_EDGEDETECT (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_GAUSSIAN_BLUR (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_SELECTIVE_BLUR (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_EMBOSS (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_MEAN_REMOVAL (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_SMOOTH (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_PIXELATE (int)
Special GD filter used by the imagefilter() function.
IMG_FILTER_SCATTER (int)
Special GD filter used by the imagefilter() function. (Available as of PHP 7.4.0)
IMAGETYPE_GIF (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JPEG (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JPEG2000 (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_PNG (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_SWF (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_PSD (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_BMP (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_WBMP (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_XBM (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_TIFF_II (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_TIFF_MM (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_IFF (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JB2 (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JPC (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JP2 (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_JPX (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_SWC (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_ICO (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
IMAGETYPE_WEBP (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions. (Available as of PHP 7.1.0)
IMAGETYPE_AVIF (int)
Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions. (Available as of PHP 8.1.0)
PNG_NO_FILTER (int)
A special PNG filter, used by the imagepng() function.
PNG_FILTER_NONE (int)
A special PNG filter, used by the imagepng() function.
PNG_FILTER_SUB (int)
A special PNG filter, used by the imagepng() function.
PNG_FILTER_UP (int)
A special PNG filter, used by the imagepng() function.
PNG_FILTER_AVG (int)
A special PNG filter, used by the imagepng() function.
PNG_FILTER_PAETH (int)
A special PNG filter, used by the imagepng() function.
PNG_ALL_FILTERS (int)
A special PNG filter, used by the imagepng() function.
IMG_FLIP_VERTICAL (int)
Used together with imageflip(), available as of PHP 5.5.0.
IMG_FLIP_HORIZONTAL (int)
Used together with imageflip(), available as of PHP 5.5.0.
IMG_FLIP_BOTH (int)
Used together with imageflip(), available as of PHP 5.5.0.
IMG_BELL (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_BESSEL (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_BILINEAR_FIXED (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_BICUBIC (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_BICUBIC_FIXED (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_BLACKMAN (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_BOX (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_BSPLINE (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_CATMULLROM (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_GAUSSIAN (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_GENERALIZED_CUBIC (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_HERMITE (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_HAMMING (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_HANNING (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_MITCHELL (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_POWER (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_QUADRATIC (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_SINC (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_NEAREST_NEIGHBOUR (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_WEIGHTED4 (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
IMG_TRIANGLE (int)
Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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User Contributed Notes 1 note

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webmaster at alexventure dot com
12 years ago
In case anyone is wondering what these filters are for, have a look at the W3C's specification:

http://www.w3.org/TR/PNG-Filters.html
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