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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.
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GD_VERSION
(string)
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The GD version PHP was compiled against.
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GD_MAJOR_VERSION
(int)
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The GD major version PHP was compiled against.
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GD_MINOR_VERSION
(int)
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The GD minor version PHP was compiled against.
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GD_RELEASE_VERSION
(int)
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The GD release version PHP was compiled against.
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The GD "extra" version (beta/rc..) PHP was compiled against.
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GD_BUNDLED
(int)
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When the bundled version of GD is used this is 1 otherwise
its set to 0.
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IMG_AVIF
(int)
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Used as a return value by imagetypes
(Available as of PHP 8.1.0)
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IMG_BMP
(int)
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Used as a return value by imagetypes
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IMG_GIF
(int)
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Used as a return value by imagetypes
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IMG_JPG
(int)
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Used as a return value by imagetypes
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IMG_JPEG
(int)
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Used as a return value by imagetypes
Note:
This constant has the same value as IMG_JPG
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IMG_PNG
(int)
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Used as a return value by imagetypes
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IMG_TGA
(int)
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Used as a return value by imagetypes
(Available as of PHP 7.4.0)
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IMG_WBMP
(int)
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Used as a return value by imagetypes
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IMG_XPM
(int)
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Used as a return value by imagetypes
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IMG_WEBP
(int)
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Used as a return value by imagetypes
(Available as of PHP 7.0.10)
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IMG_WEBP_LOSSLESS
(int)
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(Available as of PHP 8.1.0)
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IMG_COLOR_TILED
(int)
-
Special color option which can be used instead of a color allocated with
imagecolorallocate or
imagecolorallocatealpha.
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IMG_COLOR_STYLED
(int)
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Special color option which can be used instead of a color allocated with
imagecolorallocate or
imagecolorallocatealpha.
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IMG_COLOR_BRUSHED
(int)
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Special color option which can be used instead of a color allocated with
imagecolorallocate or
imagecolorallocatealpha.
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IMG_COLOR_STYLEDBRUSHED
(int)
-
Special color option which can be used instead of a color allocated with
imagecolorallocate or
imagecolorallocatealpha.
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IMG_COLOR_TRANSPARENT
(int)
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Special color option which can be used instead of a color allocated with
imagecolorallocate or
imagecolorallocatealpha.
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IMG_AFFINE_TRANSLATE
(int)
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An affine transformation type constant used by the imageaffinematrixget function.
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IMG_AFFINE_SCALE
(int)
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An affine transformation type constant used by the imageaffinematrixget function.
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IMG_AFFINE_ROTATE
(int)
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An affine transformation type constant used by the imageaffinematrixget function.
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IMG_AFFINE_SHEAR_HORIZONTAL
(int)
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An affine transformation type constant used by the imageaffinematrixget function.
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IMG_AFFINE_SHEAR_VERTICAL
(int)
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An affine transformation type constant used by the imageaffinematrixget function.
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IMG_ARC_ROUNDED
(int)
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A style constant used by the imagefilledarc function.
Note:
This constant has the same value as IMG_ARC_PIE
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IMG_ARC_PIE
(int)
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A style constant used by the imagefilledarc function.
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IMG_ARC_CHORD
(int)
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A style constant used by the imagefilledarc function.
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IMG_ARC_NOFILL
(int)
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A style constant used by the imagefilledarc function.
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IMG_ARC_EDGED
(int)
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A style constant used by the imagefilledarc function.
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IMG_GD2_RAW
(int)
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A type constant used by the imagegd2 function.
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IMG_GD2_COMPRESSED
(int)
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A type constant used by the imagegd2 function.
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IMG_EFFECT_REPLACE
(int)
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Alpha blending effect used by the imagelayereffect function.
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IMG_EFFECT_ALPHABLEND
(int)
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Alpha blending effect used by the imagelayereffect function.
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IMG_EFFECT_NORMAL
(int)
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Alpha blending effect used by the imagelayereffect function.
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IMG_EFFECT_OVERLAY
(int)
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Alpha blending effect used by the imagelayereffect function.
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IMG_EFFECT_MULTIPLY
(int)
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Alpha blending effect used by the imagelayereffect function.
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IMG_FILTER_NEGATE
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_GRAYSCALE
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_BRIGHTNESS
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_CONTRAST
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_COLORIZE
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_EDGEDETECT
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_GAUSSIAN_BLUR
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_SELECTIVE_BLUR
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_EMBOSS
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_MEAN_REMOVAL
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_SMOOTH
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_PIXELATE
(int)
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Special GD filter used by the imagefilter function.
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IMG_FILTER_SCATTER
(int)
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Special GD filter used by the imagefilter function.
(Available as of PHP 7.4.0)
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IMAGETYPE_GIF
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_JPEG
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_JPEG2000
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_PNG
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_SWF
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_PSD
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_BMP
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_WBMP
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_XBM
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_TIFF_II
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_TIFF_MM
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_IFF
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_JB2
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_JPC
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_JP2
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_JPX
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_SWC
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_ICO
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_WEBP
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
(Available as of PHP 7.1.0)
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IMAGETYPE_AVIF
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
(Available as of PHP 8.1.0)
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IMAGETYPE_UNKNOWN
(int)
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Image type constant used by the image_type_to_mime_type
and image_type_to_extension functions.
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IMAGETYPE_COUNT
(int)
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The number of image type constants (including the "unknown" type)
supported by the image_type_to_mime_type and image_type_to_extension functions
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PNG_NO_FILTER
(int)
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A special PNG filter, used by the imagepng function.
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PNG_FILTER_NONE
(int)
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A special PNG filter, used by the imagepng function.
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PNG_FILTER_SUB
(int)
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A special PNG filter, used by the imagepng function.
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PNG_FILTER_UP
(int)
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A special PNG filter, used by the imagepng function.
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PNG_FILTER_AVG
(int)
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A special PNG filter, used by the imagepng function.
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PNG_FILTER_PAETH
(int)
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A special PNG filter, used by the imagepng function.
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PNG_ALL_FILTERS
(int)
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A special PNG filter, used by the imagepng function.
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IMG_FLIP_VERTICAL
(int)
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Used together with imageflip, available as of PHP 5.5.0.
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IMG_FLIP_HORIZONTAL
(int)
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Used together with imageflip, available as of PHP 5.5.0.
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IMG_FLIP_BOTH
(int)
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Used together with imageflip, available as of PHP 5.5.0.
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IMG_BELL
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_BESSEL
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_BILINEAR_FIXED
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_BICUBIC
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_BICUBIC_FIXED
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_BLACKMAN
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_BOX
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_BSPLINE
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_CATMULLROM
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_GAUSSIAN
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_GENERALIZED_CUBIC
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_HERMITE
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_HAMMING
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_HANNING
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_MITCHELL
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_POWER
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_QUADRATIC
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_SINC
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_NEAREST_NEIGHBOUR
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_WEIGHTED4
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_TRIANGLE
(int)
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Used together with imagesetinterpolation, available as of PHP 5.5.0.
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IMG_CROP_BLACK
(int)
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Crops out a black background.
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IMG_CROP_DEFAULT
(int)
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Same as
IMG_CROP_TRANSPARENT.
Before PHP 7.4.0, the bundled libgd fell back to IMG_CROP_SIDES,
if the image had no transparent color.
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IMG_CROP_SIDES
(int)
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Uses the 4 corners of the image to attempt to detect the background to crop.
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IMG_CROP_THRESHOLD
(int)
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Crops an image using the given
threshold
and color.
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IMG_CROP_TRANSPARENT
(int)
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Crops out a transparent background.
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IMG_CROP_WHITE
(int)
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Crops out a white background.
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