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XLI. Image functions
You can use the image functions in PHP to get the size of JPEG, GIF, PNG, SWF, TIFF and JPEG2000 images, and if you have the GD library (available at http://www.boutell.com/gd/) you will also be able to create and manipulate images.
If you have PHP compiled with --enable-exif you are able to work with information stored in headers of JPEG and TIFF images. These functions do not require GD library.
The format of images you are able to manipulate depend on the version of gd you install, and any other libraries gd might need to access those image formats. Versions of gd older than gd-1.6 support gif format images, and do not support png, where versions greater than gd-1.6 support png, not gif.
In order to read and write images in jpeg format, you will need to obtain and install jpeg-6b (available at ftp://ftp.uu.net/graphics/jpeg/), and then recompile gd to make use of jpeg-6b. You will also have to compile PHP with --with-jpeg-dir=/path/to/jpeg-6b.
To add support for Type 1 fonts, you can install t1lib (available at ftp://sunsite.unc.edu/pub/Linux/libs/graphics/), and then add --with-t1lib[=dir].
- Obsah
- exif_imagetype — Determine the type of an image
- exif_read_data — Read the EXIF headers from JPEG or TIFF
- exif_thumbnail — Retrieve the embedded thumbnail of a TIFF or JPEG image
- getimagesize — Get the size of an image
- image2wbmp — Output image to browser or file
- imagealphablending — Set the blending mode for an image
- imagearc — Draw a partial ellipse
- imagefilledarc — Draw a partial ellipse and fill it
- imageellipse — Draw an ellipse
- imagefilledellipse — Draw a filled ellipse
- imagechar — Draw a character horizontally
- imagecharup — Draw a character vertically
- imagecolorallocate — Allocate a color for an image
- imagecolordeallocate — De-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
- imagecolorclosestthwb — Get the index of the color which has the hue, white and blackness nearest to the given color
- imagecolorexact — Get the index of the specified color
- imagecolorexactalpha — Get the index of the specified color + alpha
- 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
- imagegammacorrect — Apply a gamma correction to a GD image
- 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
- 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
- imagecopyresized — Copy and resize part of an image
- imagecopyresampled — Copy and resize part of an image with resampling
- imagecreate — Create a new palette based image
- imagecreatetruecolor — Create a new true color image
- imagetruecolortopalette — Convert a true color image to a palette image
- imagecreatefromgd — Create a new image from GD 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
- 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
- imagecreatefromwbmp — Create a new image from file or URL
- imagecreatefromstring — Create a new image from the image stream in the string
- imagecreatefromxbm — Create a new image from file or URL
- imagecreatefromxpm — Create a new image from file or URL
- imagedashedline — Draw a dashed line
- imagedestroy — Destroy an image
- imagefill — Flood fill
- imagefilledpolygon — Draw a filled polygon
- imagefilledrectangle — Draw a filled rectangle
- imagefilltoborder — Flood fill to specific color
- imagefontheight — Get font height
- imagefontwidth — Get font width
- imagegd — Output GD image to browser or file
- imagegd2 — Output GD2 image to browser or file
- imagegif — Output image to browser or file
- imagepng — Output a PNG image to either the browser or a file
- imagejpeg — Output image to browser or file
- imagewbmp — Output image to browser or file
- imageinterlace — Enable or disable interlace
- imageline — Draw a line
- imageloadfont — Load a new font
- imagepalettecopy — Copy the palette from one image to another
- imagepolygon — Draw a polygon
- imagepsbbox — Give the bounding box of a text rectangle using PostScript Type1 fonts
- imagepsencodefont — Change the character encoding vector of a font
- imagepsfreefont — Free memory used by a PostScript Type 1 font
- imagepsloadfont — Load a PostScript Type 1 font from file
- imagepsextendfont — Extend or condense a font
- imagepsslantfont — Slant a font
- imagepstext — To draw a text string over an image using PostScript Type1 fonts
- imagerectangle — Draw a rectangle
- imagesetpixel — Set a single pixel
- imagesetbrush — Set the brush image for line drawing
- imagesetstyle — Set the style for line drawing
- imagesettile — Set the tile image for filling
- imagesetthickness — Set the thickness for line drawing
- imagestring — Draw a string horizontally
- imagestringup — Draw a string vertically
- imagesx — Get image width
- imagesy — Get image height
- imagettfbbox — Give the bounding box of a text using TrueType fonts
- imageftbbox — Give the bounding box of a text using fonts via freetype2
- imagettftext — Write text to the image using TrueType fonts
- imagefttext — Write text to the image using fonts using FreeType 2
- imagetypes — Return the image types supported by this PHP build
- jpeg2wbmp — Convert JPEG image file to WBMP image file
- png2wbmp — Convert PNG image file to WBMP image file
- iptcembed — Embed binary IPTC data into a JPEG image
- read_exif_data — Reads header information stored in TIFF and JPEG images
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