Parsing the set of commonly used image image functions in PHP_PHP tutorial

gd_info函数：获取当前安装的GD库的信息　
getimagesize函数：获取图像的大小　
image_type_to_extension函数：获取图像类型的文件后缀　
image_type_to_mime_type函数：判断一个IMAGETYPE常量的MIME类型　
image2wbmp函数：以WBMP格式将图像输出到浏览器或文件　
imagealphablending函数：设定图像的混色模式　
imageantialias函数：是否使用antialias(抗锯齿)功能　
imagearc函数：画椭圆弧　
imagechar函数：水平地画一个字符　
imagecharup函数：垂直地画一个字符　
imagecolorallocate函数：为一幅图像分配颜色　
imagecolorallocatealpha 函数：为一幅图像分配颜色+alpha　
imagecolorat函数：获取某像素的颜色索引值　
imagecolorclosest函数：获取与指定颜色最接近的颜色的索引值　
imagecolorclosestalpha函数：获取与指定颜色加透明度最接近的颜色的索引值
imagecolorclosesthwb函数：获取与指定颜色最接近的色度的黑白色的索引　
imagecolordeallocate函数：取消图像颜色的分配　
imagecolorexact函数：获取指定颜色的索引值　
imagecolorexactalpha函数：获取指定颜色加透明度的索引值　
imagecolormatch函数：使一个图像中调色板版本的颜色与真彩色版本更能匹配
imagecolorresolve函数：获取指定颜色的索引值或有可能得到的最接近的替代值
imagecolorresolvealpha函数：获取指定颜色透明度的索引值或有可能得到的最接近的替代值　
imagecolorset函数：给指定调色板索引设定颜色　
imagecolorsforindex函数：获取某索引的颜色　
imagecolorstotal函数：获取一幅图像的调色板中颜色的数目　
imagecolortransparent函数：将某个颜色定义为透明色　
imageconvolution函数：申请一个3*3的卷积矩阵　
imagecopy函数：复制图像的一部分　
imagecopymerge函数：复制并合并图像的一部分　
imagecopymergegray函数：用灰度复制并合并图像的一部分
imagecopyresampled函数：重采样复制部分图像并调整大小
imagecopyresized函数：复制部分图像并调整大小
imagecreate函数：新建一个基于调色板的图像

imagecreatefromgd2 function: Create a new image from a GD 2 file or URL
imagecreatefromgd2part function: Create a new image from a part of a given GD 2 file or URL
imagecreatefromgd function: Create a new image from a GD file or URL An image
imagecreatefromgif function: Create a new image from a GIF file or URL
imagecreatefromjpeg function: Create a new image from a JPEG file or URL
imagecreatefrompng function: Create a new image from a PNG file or URL
imagecreatefromstring function: Create a new image from the image stream in the string
imagecreatefromwbmp function: Create a new image from a WBMP file or URL
imagecreatefromxbm function: Create a new image from an XBM file or URL
imagecreatefromxpm function: From Create a new image in an XPM file or URL
imagecreatetruecolor function: create a true color image
imagedashedline function: draw a dotted line
imagedestroy function: destroy an image
imageellipse function: draw an ellipse
imagefill Function: fill an area with the specified color
imagefilledarc function: draw an elliptical arc and fill it
imagefilledellipse function: draw an ellipse and fill it
imagefilledpolygon function: draw a polygon and fill it
imagefilledrectangle function: draw an Rectangle and fill it
imagefilltoborder function: fill the area until the border of the specified color
imagefilter function: use a filter on the image
imagefontheight function: get the font height
imagefontwidth function: get the font width
imageftbbox Function: gives a text box using FreeType2 font
imagefttext function: writes text to image using FreeType2 font
imagegammacorrect function: applies gamma correction to GD image
imagegd2 function: outputs GD 2 image to browser browser or file
imagegd function: output GD image to browser or file
imagegif function: output image in GIF format to browser or file
imageinterlace function: activate or disable interlacing
imageistruecolor Function: Check whether the image is a true color image
imagejpeg function: Output the image to a browser or file in JPEG format
imagelayereffect function: Set the alpha color mixing flag to use the bound libgd layering effect
imageline Function: draw a line segment
imageloadfont function: load a new font
imagepalettecopy function: copy the palette from one image to another
imagepng function: output the image to the browser in PNG format Or file
imagepolygon function: draw a polygon
imagepsbbox function: give a text box using PostScript Type1 font
imagepsencodefont function: change the character encoding vector in the font
imagepsextendfont function: expand or streamline the font
imagepsfreefont function: release the memory occupied by a PostScript Type1 font
imagepsloadfont function: load a PostScript Type1 font from a file
imagepsslantfont function: tilt a font
imagepstext function: use PostScript Type1 font to convert text The string is drawn on the image
imagerectangle function: draw a rectangle
imagerotate function: rotate the image with a given angle
imagesavealpha function: set the flag to save the complete alpha channel information when saving the PNG image
imagesetbrush function: set the brush image for drawing lines
imagesetpixel function: draw a single pixel
imagesetstyle function: set the style of line drawing
imagesetthickness function: set the width of line drawing
imagesettile Function: Set the texture used for filling
imagestring function: draw a line of string horizontally
imagestringup function: draw a line of string vertically
imagesx function: get the image width
imagesy function: get the image Height
imagetruecolortopalette function: Convert a true color image to a palette image
imagettfbbox function: Get the range of text using TrueType fonts
imagettftext function: Write text to an image with TrueType fonts
imagetypes function : Returns the image type supported by the current PHP version
imagewbmp function: Output the image to the browser or file in WBMP format
imagexbm function: Output the XBM image to the browser or file
iptcembed function: Convert the binary IPTC data is embedded in a JPEG image
iptcparse function: parses binary IPTC blocks into a single token
jpeg2wbmp function: converts a JPEG image file to a WBMP image file
png2wbmp function: converts a PNG image file to WBMP Image file

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