PHP Learning notes-----GD Library

use of the GD library in PHP

the latest The GD library version supports image files in GIF,JPEG,PNG,WBMP,XBM, and other formats.

Creating an image should complete the 4 steps shown below .

(1) creating a canvas

(2) drawing Images

(3) output Image

(4) Releasing Resources

Canvas Management

Imagecreate ()// Create a new palette-based image

Imagecreatetruecolor ()// Create a new true color image

Set color

Imagecolorallocate ()// assigning colors to an image

Generate images

Imagegif ()

Imagejpeg ()

Imagepng ()

Imagewbmp ()

Drawing an image

Imagefill ()// area fill

Imagesetpixel ()// Draw point

Imageline ()// Draw line

Imagerectangle ()// draw a rectangle

Imagefilledpolygon ()// Draw a polygon and fill

Imageellipse ()// draw an ellipse

Imagefilledellipse ()// Draw an ellipse and fill

Imagearc ()// Draw Elliptical Arc

Draw text

Imagestring ()// draw a line of string horizontally

Imagestringup ()// draw a line of string vertically

Imagechar ()// to draw a character horizontally

Imagecharup ()// to draw a character vertically

Imagettftext ()// Set Font

Picture Background Management

Imagecreatefromjpeg ()

Imagecreatefrompng ()

Imagecreatefromgif ()

GetImageSize ()

Picture copy

Imagecopyresampled ()// image can be scaled and trimmed

Imagecopy ()// watermark can be added

Picture rotation and rollover

Imagerotate ()

PHP Learning notes-----GD Library