Php image watermark adding, compression, and cutting encapsulation

: This article describes how to add, compress, and cut php image watermarks. For more information about PHP tutorials, see. Php's operations on image files mainly use the GD Library extension. When we frequently use php to operate images, we will naturally encapsulate many functions. Otherwise, we will write too much repeated code. When there are many functions related to images, we can consider sorting out these functions, so we have the idea of encapsulating them into classes.

The procedure for image operations is as follows:

1. Open image
2. Operate images
3. Output Image
4. Destroy images

1, 3, 4 three steps should be written each time, and each time is similar. You only need to perform image operations. Images are often operated by one or more major GD functions.

This article encapsulates four methods in the class: text watermark (imagettftext (), image watermark (imagecopymerge (), image compression, image cutting (imagecopyresampled ()), the rest of the commonly used GD functions will not be described in detail. Directly run the code:

 Info = getimagesize ($ src); $ this-> type = image_type_to_extension ($ this-> info ['2'], false ); $ fun = "imagecreatefrom {$ this-> type}"; $ this-> image = $ fun ($ src );} /*** text watermark ** @ param [type] $ font * @ param [type] $ content * @ param [type] $ size text size * @ param [type] $ col text color (quaternary group) * @ param array $ location * @ param integer $ angle skew angle * @ return [type] */public function fontMark ($ font, $ content, $ size, $ col, $ Location, $ angle = 0) {$ col = imagecolorallocatealpha ($ this-> image, $ col ['0'], $ col ['1'], $ col ['2'], $ col ['3']); imagettftext ($ this-> image, $ size, $ angle, $ location ['0'], $ location ['1'], $ col, $ font, $ content );} /*** image watermark ** @ param [type] $ imageMark watermark image address * @ param [type] $ dst watermark image position in the original image * @ param [type] $ pct transparency * @ return [type] */public function imageMark ($ imageMark, $ dst, $ pct) {$ info2 = getimagesize ($ im AgeMark); $ type = image_type_to_extension ($ info2 ['2'], false); $ func2 = "imagecreatefrom ". $ type; $ water = $ func2 ($ imageMark); imagecopymerge ($ this-> image, $ water, $ dst [0], $ dst [1], 0, 0, $ info2 ['0'], $ info2 ['1'], $ pct); imagedestroy ($ water );} /*** compress the image ** @ param [type] $ thumbSize: compress the image size * @ return [type] [description] */public function thumb ($ thumbSize) {$ imageThumb = imagecreatetruecolor ($ thumbSize [0], $ t HumbSize [1]); imagecopyresampled ($ imageThumb, $ this-> image, 0, 0, 0, 0, $ thumbSize [0], $ thumbSize [1], $ this-> info ['0'], $ this-> info ['1']); imagedestroy ($ this-> image ); $ this-> image = $ imageThumb ;} /*** crop an image ** @ param [type] $ cutSize crop size * @ param [type] $ location crop position * @ return [type] [description] */public function cut ($ cutSize, $ location) {$ imageCut = imagecreatetruecolor ($ cutSize [0], $ cutSize [1]); im Agecopyresampled ($ imageCut, $ this-> image, 0, 0, $ location [0], $ location [1], $ cutSize [0], $ cutSize [1], $ cutSize [0], $ cutSize [1]); imagedestroy ($ this-> image); $ this-> image = $ imageCut ;} /*** display image ** @ return [type] [description] */public function show () {header ("content-type :". $ this-> info ['Mime ']); $ funn = "image ". $ this-> type; $ funn ($ this-> image);}/*** save image * @ param [type] $ newname New image Title * @ return [type] [Description] */public function save ($ newname) {header ("content-type :". $ this-> info ['Mime ']); $ funn = "image ". $ this-> type; $ funn ($ this-> image, $ newname. '. '. $ this-> type);} public function _ destruct () {imagedestroy ($ this-> image) ;}}?>

If you need other operations, just add them to this class ~~

The above describes how to add, compress, and cut watermarks to php images, including some content. I hope my friends who are interested in PHP tutorials will be helpful.