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。
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GD_VERSION
(string) - PHP 编译所依据的 GD 版本。
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GD_MAJOR_VERSION
(int) - PHP 编译所依据的 GD 大版本。
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GD_MINOR_VERSION
(int) - PHP 编译所依据的 GD 小版本。
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GD_RELEASE_VERSION
(int) - PHP 编译所依据的 GD 发布版本。
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GD_EXTRA_VERSION
(string) - PHP 编译所依据的 GD 扩展版本(beta/rc..)。
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GD_BUNDLED
(int) - 当使用绑定版本的 GD 时,此值为 1,反之为 0。
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IMG_AVIF
(int) - Used as a return value by imagetypes() (自 PHP 8.1.0 起可用)
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IMG_BMP
(int) - Used as a return value by imagetypes()
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IMG_GIF
(int) - Used as a return value by imagetypes()
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IMG_JPG
(int) - Used as a return value by imagetypes()
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IMG_JPEG
(int) -
Used as a return value by imagetypes()
注意:
本常量值同
IMG_JPG
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IMG_PNG
(int) - Used as a return value by imagetypes()
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IMG_TGA
(int) - Used as a return value by imagetypes() (自 PHP 7.4.0 起可用)
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IMG_WBMP
(int) - Used as a return value by imagetypes()
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IMG_XPM
(int) - Used as a return value by imagetypes()
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IMG_WEBP
(int) - Used as a return value by imagetypes() (自 PHP 7.0.10 起可用)
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IMG_WEBP_LOSSLESS
(int) - (自 PHP 8.1.0 起可用)
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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) - Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().
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IMG_COLOR_BRUSHED
(int) - 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) - Special color option which can be used instead of a color allocated with imagecolorallocate() or imagecolorallocatealpha().
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IMG_AFFINE_TRANSLATE
(int) - An affine transformation type constant used by the imageaffinematrixget() function.
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IMG_AFFINE_SCALE
(int) - An affine transformation type constant used by the imageaffinematrixget() function.
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IMG_AFFINE_ROTATE
(int) - An affine transformation type constant used by the imageaffinematrixget() function.
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IMG_AFFINE_SHEAR_HORIZONTAL
(int) - An affine transformation type constant used by the imageaffinematrixget() function.
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IMG_AFFINE_SHEAR_VERTICAL
(int) - An affine transformation type constant used by the imageaffinematrixget() function.
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IMG_ARC_ROUNDED
(int) -
A style constant used by the imagefilledarc() function.
注意:
此常量值同
IMG_ARC_PIE
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IMG_ARC_PIE
(int) - A style constant used by the imagefilledarc() function.
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IMG_ARC_CHORD
(int) - A style constant used by the imagefilledarc() function.
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IMG_ARC_NOFILL
(int) - A style constant used by the imagefilledarc() function.
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IMG_ARC_EDGED
(int) - A style constant used by the imagefilledarc() function.
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IMG_GD2_RAW
(int) - A type constant used by the imagegd2() function.
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IMG_GD2_COMPRESSED
(int) - A type constant used by the imagegd2() function.
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IMG_EFFECT_REPLACE
(int) - Alpha blending effect used by the imagelayereffect() function.
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IMG_EFFECT_ALPHABLEND
(int) - Alpha blending effect used by the imagelayereffect() function.
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IMG_EFFECT_NORMAL
(int) - Alpha blending effect used by the imagelayereffect() function.
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IMG_EFFECT_OVERLAY
(int) - Alpha blending effect used by the imagelayereffect() function.
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IMG_EFFECT_MULTIPLY
(int) - Alpha blending effect used by the imagelayereffect() function.
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IMG_FILTER_NEGATE
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_GRAYSCALE
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_BRIGHTNESS
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_CONTRAST
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_COLORIZE
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_EDGEDETECT
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_GAUSSIAN_BLUR
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_SELECTIVE_BLUR
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_EMBOSS
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_MEAN_REMOVAL
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_SMOOTH
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_PIXELATE
(int) - Special GD filter used by the imagefilter() function.
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IMG_FILTER_SCATTER
(int) - Special GD filter used by the imagefilter() function. (自 PHP 7.4.0 版本可用)
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IMAGETYPE_GIF
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_JPEG
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_JPEG2000
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_PNG
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_SWF
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_PSD
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_BMP
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_WBMP
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_XBM
(int) - 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) - 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) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_IFF
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_JB2
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_JPC
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_JP2
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_JPX
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_SWC
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_ICO
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_WEBP
(int) - 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)
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IMAGETYPE_AVIF
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions. (自 PHP 8.1.0 起可用)
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IMAGETYPE_UNKNOWN
(int) - Image type constant used by the image_type_to_mime_type() and image_type_to_extension() functions.
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IMAGETYPE_COUNT
(int) - 可用于 image_type_to_mime_type() 和 image_type_to_extension() 函数的图像类型常量编号(包括 unknown 类型)。
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PNG_NO_FILTER
(int) - A special PNG filter, used by the imagepng() function.
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PNG_FILTER_NONE
(int) - A special PNG filter, used by the imagepng() function.
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PNG_FILTER_SUB
(int) - A special PNG filter, used by the imagepng() function.
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PNG_FILTER_UP
(int) - A special PNG filter, used by the imagepng() function.
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PNG_FILTER_AVG
(int) - A special PNG filter, used by the imagepng() function.
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PNG_FILTER_PAETH
(int) - A special PNG filter, used by the imagepng() function.
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PNG_ALL_FILTERS
(int) - A special PNG filter, used by the imagepng() function.
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IMG_FLIP_VERTICAL
(int) - Used together with imageflip(), available as of PHP 5.5.0.
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IMG_FLIP_HORIZONTAL
(int) - Used together with imageflip(), available as of PHP 5.5.0.
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IMG_FLIP_BOTH
(int) - Used together with imageflip(), available as of PHP 5.5.0.
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IMG_BELL
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_BESSEL
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_BILINEAR_FIXED
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_BICUBIC
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_BICUBIC
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_BLACKMAN
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_BOX
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_BSPLINE
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_CATMULLROM
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_GAUSSIAN
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_GENERALIZED_CUBIC
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_HERMITE
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_HAMMING
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_HANNING
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_MITCHELL
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_POWER
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_QUADRATIC
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_SINC
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_NEAREST_NEIGHBOUR
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_WEIGHTED4
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_TRIANGLE
(int) - Used together with imagesetinterpolation(), available as of PHP 5.5.0.
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IMG_CROP_BLACK
(int) - 裁剪出黑色背景。
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IMG_CROP_DEFAULT
(int) -
等同于
IMG_CROP_TRANSPARENT
。在 PHP 7.4.0 之前,如果图像没有透明色,则捆绑的 libgd 将恢复为IMG_CROP_SIDES
。 -
IMG_CROP_SIDES
(int) - 使用图像的 4 个角尝试检测要裁剪的背景。
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IMG_CROP_THRESHOLD
(int) -
使用指定
threshold
和color
裁切图片。 -
IMG_CROP_TRANSPARENT
(int) - 裁剪出透明背景。
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IMG_CROP_WHITE
(int) - 裁剪出白色背景。
+添加备注
用户贡献的备注 1 note
webmaster at alexventure dot com ¶
13 years ago
In case anyone is wondering what these filters are for, have a look at the W3C's specification:
http://www.w3.org/TR/PNG-Filters.html