[[GD_Library]](beta)

GDLIB is a library for graphical dynamic web development with functions to create PNG or JPEG images on the fly. It allows your code to draw images with lines, arcs, text and multiple colors. You may program scripts to do lots of image manupulation operations such as cut and paste from other images, flood fills, and stream out the end result as a PNG or GIF while also saving to a JPEG file.

[[GD_library function:var1|var2]]

Macro Parameters:

library function: Name of Library function to be used. (see list below)

var1: variable name to be used to contain resulting status if any.

var2: variable or string containing one or more  ‘php style’  gdlib function parameters. These parameters are defined separately for each GDLIB function and may be seen by referencing links in the complete function list shown below.

Examples  of usage:

[[GD_imagecreate:success|$width , $height]]
[[if:$success===TRUE]]
etc...
[[ELSE]]
etc..
[[END_IF]]

or

[[INITIALIZE:var2|'480' , '640']]
[[GD_imagecreate:success|$var2]]
[[if:$success===TRUE]]
etc...
[[ELSE]]
etc..
[[END_IF]]

Sets the variable labeled as success to boolean TRUE or FALSE depending on operational success.  The variables to the right of the pipe symbol are parameters used as specified in the following list.

GDLIB and EXIF Function list. (with links to php.net parameter specs.)

• exif_imagetype — Determine the type of an image
• exif_read_data — Reads the EXIF headers from JPEG or TIFF
• exif_tagname — Get the header name for an index
• exif_thumbnail — Retrieve the embedded thumbnail of a TIFF or JPEG image
• read_exif_data — Alias of exif_read_data
• gd_info — Retrieve information about the currently installed GD library
• getimagesize — Get the size of an image
• getimagesizefromstring — Get the size of an image from a string
• image_type_to_extension — Get file extension for image type
• image_type_to_mime_type — Get Mime-Type for image-type returned by getimagesize, exif_read_data, exif_thumbnail, exif_imagetype
• image2wbmp — Output image to browser or file
• imageaffine — Return an image containing the affine transformed src image, using an optional clipping area
• imageaffinematrixconcat — Concatenate two affine transformation matrices
• imageaffinematrixget — Get an affine transformation matrix
• imagealphablending — Set the blending mode for an image
• imageantialias — Should antialias functions be used or not
• imagearc — Draws an arc
• imagebmp — Output a BMP image to browser or file
• imagechar — Draw a character horizontally
• imagecharup — Draw a character vertically
• imagecolorallocate — Allocate a color for an image
• imagecolorallocatealpha — Allocate a color for an image
• imagecolorat — Get the index of the color of a pixel
• imagecolorclosest — Get the index of the closest color to the specified color
• imagecolorclosestalpha — Get the index of the closest color to the specified color + alpha
• imagecolorclosesthwb — Get the index of the color which has the hue, white and blackness
• imagecolordeallocate — De-allocate a color for an image
• imagecolorexact — Get the index of the specified color
• imagecolorexactalpha — Get the index of the specified color + alpha
• imagecolormatch — Makes the colors of the palette version of an image more closely match the true color version
• imagecolorresolve — Get the index of the specified color or its closest possible alternative
• imagecolorresolvealpha — Get the index of the specified color + alpha or its closest possible alternative
• imagecolorset — Set the color for the specified palette index
• imagecolorsforindex — Get the colors for an index
• imagecolorstotal — Find out the number of colors in an image’s palette
• imagecolortransparent — Define a color as transparent
• imageconvolution — Apply a 3×3 convolution matrix, using coefficient and offset
• imagecopy — Copy part of an image
• imagecopymerge — Copy and merge part of an image
• imagecopymergegray — Copy and merge part of an image with gray scale
• imagecopyresampled — Copy and resize part of an image with resampling
• imagecopyresized — Copy and resize part of an image
• imagecreate — Create a new palette based image
• imagecreatefrombmp — Create a new image from file or URL
• imagecreatefromgd2 — Create a new image from GD2 file or URL
• imagecreatefromgd2part — Create a new image from a given part of GD2 file or URL
• imagecreatefromgd — Create a new image from GD file or URL
• imagecreatefromgif — Create a new image from file or URL
• imagecreatefromjpeg — Create a new image from file or URL
• imagecreatefrompng — Create a new image from file or URL
• imagecreatefromstring — Create a new image from the image stream in the string
• imagecreatefromwbmp — Create a new image from file or URL
• imagecreatefromwebp — Create a new image from file or URL
• imagecreatefromxbm — Create a new image from file or URL
• imagecreatefromxpm — Create a new image from file or URL
• imagecreatetruecolor — Create a new true color image
• imagecrop — Crop an image to the given rectangle
• imagecropauto — Crop an image automatically using one of the available modes
• imagedashedline — Draw a dashed line
• imagedestroy — Destroy an image
• imageellipse — Draw an ellipse
• imagefill — Flood fill
• imagefilledarc — Draw a partial arc and fill it
• imagefilledellipse — Draw a filled ellipse
• imagefilledpolygon — Draw a filled polygon
• imagefilledrectangle — Draw a filled rectangle
• imagefilltoborder — Flood fill to specific color
• imagefilter — Applies a filter to an image
• imageflip — Flips an image using a given mode
• imagefontheight — Get font height
• imagefontwidth — Get font width
• imageftbbox — Give the bounding box of a text using fonts via freetype2
• imagefttext — Write text to the image using fonts using FreeType 2
• imagegammacorrect — Apply a gamma correction to a GD image
• imagegd2 — Output GD2 image to browser or file
• imagegd — Output GD image to browser or file
• imagegetclip — Get the clipping rectangle
• imagegif — Output image to browser or file
• imagegrabscreen — Captures the whole screen
• imagegrabwindow — Captures a window
• imageinterlace — Enable or disable interlace
• imageistruecolor — Finds whether an image is a truecolor image
• imagejpeg — Output image to browser or file
• imagelayereffect — Set the alpha blending flag to use layering effects
• imageline — Draw a line
• imageloadfont — Load a new font
• imageopenpolygon — Draws an open polygon
• imagepalettecopy — Copy the palette from one image to another
• imagepalettetotruecolor — Converts a palette based image to true color
• imagepng — Output a PNG image to either the browser or a file
• imagepolygon — Draws a polygon
• imagepsbbox — Give the bounding box of a text rectangle using PostScript Type1 fonts
• imagepsencodefont — Change the character encoding vector of a font
• imagepsextendfont — Extend or condense a font
• imagepsfreefont — Free memory used by a PostScript Type 1 font
• imagepsloadfont — Load a PostScript Type 1 font from file
• imagepsslantfont — Slant a font
• imagepstext — Draws a text over an image using PostScript Type1 fonts
• imagerectangle — Draw a rectangle
• imageresolution — Get or set the resolution of the image
• imagerotate — Rotate an image with a given angle
• imagesavealpha — Set the flag to save full alpha channel information (as opposed to single-color transparency) when saving PNG images
• imagescale — Scale an image using the given new width and height
• imagesetbrush — Set the brush image for line drawing
• imagesetclip — Set the clipping rectangle
• imagesetinterpolation — Set the interpolation method
• imagesetpixel — Set a single pixel
• imagesetstyle — Set the style for line drawing
• imagesetthickness — Set the thickness for line drawing
• imagesettile — Set the tile image for filling
• imagestring — Draw a string horizontally
• imagestringup — Draw a string vertically
• imagesx — Get image width
• imagesy — Get image height
• imagetruecolortopalette — Convert a true color image to a palette image
• imagettfbbox — Give the bounding box of a text using TrueType fonts
• imagettftext — Write text to the image using TrueType fonts
• imagetypes — Return the image types supported by this PHP build
• imagewbmp — Output image to browser or file
• imagewebp — Output a WebP image to browser or file
• imagexbm — Output an XBM image to browser or file
• iptcembed — Embeds binary IPTC data into a JPEG image
• iptcparse — Parse a binary IPTC block into single tags.
• jpeg2wbmp — Convert JPEG image file to WBMP image file
• png2wbmp — Convert PNG image file to WBMP image file

By now you should be starting to realize just how cool php.net actually is!