预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

GD_VERSION ( string)

PHP 编译所依据的 GD 版本。 （PHP 5.2.4 可用）

GD_MAJOR_VERSION ( integer)

PHP 编译所依据的 GD 大版本。 （PHP 5.2.4 可用）

GD_MINOR_VERSION ( integer)

PHP 编译所依据的 GD 小版本。 （PHP 5.2.4 可用）

GD_RELEASE_VERSION ( integer)

PHP 编译所依据的 GD 发布版本。 （PHP 5.2.4 可用）

GD_EXTRA_VERSION ( string)

PHP 编译所依据的 GD 扩展版本（beta/rc..）。 （PHP 5.2.4 可用）

GD_BUNDLED ( integer)

当使用绑定版本的 GD 时，此值为 1， 反之为 0。

IMG_BMP ( integer)

Used as a return value by imagetypes()

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:

本常量值同 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_WEBP ( integer)

Used as a return value by imagetypes() PHP 5.6.25 和 PHP 7.0.10 版本中都可用。

IMG_COLOR_TILED ( integer)

Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().

IMG_COLOR_STYLED ( integer)

Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().

IMG_COLOR_BRUSHED ( integer)

Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().

IMG_COLOR_STYLEDBRUSHED ( integer)

Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().

IMG_COLOR_TRANSPARENT ( integer)

Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().

IMG_AFFINE_TRANSLATE ( integer)

An affine transformation type constant used by the imageaffinematrixget() function.

IMG_AFFINE_SCALE ( integer)

An affine transformation type constant used by the imageaffinematrixget() function.

IMG_AFFINE_ROTATE ( integer)

An affine transformation type constant used by the imageaffinematrixget() function.

IMG_AFFINE_SHEAR_HORIZONTAL ( integer)

An affine transformation type constant used by the imageaffinematrixget() function.

IMG_AFFINE_SHEAR_VERTICAL ( integer)

An affine transformation type constant used by the imageaffinematrixget() function.

IMG_ARC_ROUNDED ( integer)

A style constant used by the imagefilledarc() function.

Note:

此常量值同 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_EFFECT_MULTIPLY ( 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. （PHP 5.3.0 可用）

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_JPEG2000 ( 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. (自 PHP 5.3.0 开始支持)

IMAGETYPE_WEBP ( integer)

Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions. (从 PHP 7.1.0 开始支持)

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.

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 ( 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.