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.