预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

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)

GD_BUNDLE (integer)

When the bundled version of GD is used this is 1 otherwise its set to 0.

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 IMG_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.

IMG_FILTER_PIXELATE (integer)

Special GD filter used by the imagefilter() function. (Available as of PHP 5.3.0)

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.