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)

IMG_FILTER_SCATTER (integer)
Special GD filter used by the imagefilter function. (自 PHP 7.4.0 版本可用)

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.