Php image operations (image watermarking)

Php image operations (image watermarking)

We provide you with a php image Operation class, which can be used to add watermarks to images. For more information, see. Complete Image operation code. ChangeSize (80, 50); // change the size $ img-> changeSize (80); // change the size $ img-> create (); $ img-> free (); $ img = new Image('pic.jpg '); $ img-> addWatermark('logo.jpg', 50); // add a watermark. The first parameter is the watermark image address, the second parameter is the transparent value $ img-> create (); $ img-> free (); site http://bbs.it-home.org */Class Image {var $ imageResource = NULL; var $ target = NULL; var $ enableTypes = array (); var $ imageInfo = array (); var $ createFunc = ''; var $ imageType = NULL;/* Construct for this class * @ param string $ image * @ return Image */function Image ($ image = NULL) {// get enables if (imagetypes () & IMG_GIF) {$ this-> enableTypes [] = 'image/GIF';} if (imagetypes () & IMG_JPEG) {$ this-> enableTypes [] = 'I Mage/jpeg ';} if (imagetypes () & IMG_JPG) {$ this-> enableTypes [] = 'image/jpg';} if (imagetypes () & IMG_PNG) {$ this-> enableTypes [] = 'image/png ';} // end get if ($ image! = NULL) {$ this-> setImage ($ image) ;}/ * set a image resource * @ param string $ image * @ return boolean */function setImage ($ image) {if (file_exists ($ image) & is_file ($ image) {$ this-> imageInfo = getimagesize ($ image ); $ img_mime = strtolower ($ this-> imageInfo ['Mime ']); if (! In_array ($ img_mime, $ this-> enableTypes) {exit ('the system cannot operate on this image type. ');} switch ($ img_mime) {case 'image/GIF': $ link = imagecreatefromgif ($ image); $ this-> createFunc = 'imagegif '; $ this-> imageType = 'GIF'; break; case 'image/jpeg ': case 'image/jpg': $ link = imagecreatefromjpeg ($ image ); $ this-> createFunc = 'imagejpeg '; $ this-> imageType = 'jpeg'; break; case 'image/png ': $ link = imagecreatefrompng ($ image); $ This-> createFunc = 'imagepng '; $ this-> imageType = 'PNG'; break; default: $ link = 'unknow '; $ this-> imageType = 'unknow'; break;} if ($ link! = 'Unknow') {$ this-> imageResource = $ link;} else {exit ('this image type cannot be changed. ');} unset ($ link); return true;} else {return false;}/* set header */function setHeader () {switch ($ this-> imageType) {case 'GIF': header ('content-type: image/GIF'); break; case 'jpeg ': header ('content-type: image/jpeg '); break; case 'PNG ': header ('content-type: image/png'); break; default: exit ('Can not set header. '); bre Ak;} return true;}/* change the image size * @ param int $ width * @ param int $ height * @ return boolean */function changeSize ($ width, $ height =-1) {if (! Is_resource ($ this-> imageResource) {exit ('you cannot change the image size, maybe because you have not set the image source. ');} $ s_width = $ this-> imageInfo [0]; $ s_height = $ this-> imageInfo [1]; $ width = intval ($ width ); $ height = intval ($ height); if ($ width <= 0) exit ('image width must be greater than zero. '); if ($ height <= 0) {$ height = ($ s_height/$ s_width) * $ width;} $ this-> target = imagecreatetruecolor ($ width, $ height); if (@ imagecopyresized ($ this-> target, $ this-> imageResource, 0, 0, 0, 0, $ width, $ height, $ s_width, $ s_height) return true; else return false ;} /* Add watermark * @ param string $ image * @ param int $ app */function addWatermark ($ image, $ app = 50) {if (file_exists ($ image) & is_file ($ image) {$ s_info = getimagesize ($ image);} else {exit ($ image. 'The file does not exist. ') ;}$ r_width = $ s_info [0]; $ r_height = $ s_info [1]; if ($ r_width> $ this-> imageInfo [0]) exit ('watermark image must be smaller than the object '); If ($ r_height> $ this-> imageInfo [1]) exit ('watermark image must be smaller than the target image '); switch ($ s_info ['Mime ']) {case 'image/GIF': $ resource = imagecreatefromgif ($ image); break; case 'image/jpeg ': case 'image/jpg ': $ resource = imagecreatefromjpeg ($ image); break; case 'image/png': $ resource = imagecreatefrompng ($ image); break; default: exit ($ s_info ['Mime ']. the 'Type cannot be used as the watermark source. '); break;} $ this-> target = & $ this-> imageResource; Imagecopymerge ($ this-> target, $ resource, $ this-> imageInfo [0]-$ r_width-5, $ this-> imageInfo [1]-$ r_height-5, 0, 0, $ r_width, $ r_height, $ app); imagedestroy ($ resource); unset ($ resource );} /* create image * @ param string $ name * @ return boolean */function create ($ name = NULL) {$ function = $ this-> createFunc; if ($ this-> target! = NULL & is_resource ($ this-> target) {if ($ name! = NULL) {$ function ($ this-> target, $ name);} else {$ function ($ this-> target);} return true ;} else if ($ this-> imageResource! = NULL & is_resource ($ this-> imageResource) {if ($ name! = NULL) {$ function ($ this-> imageResource, $ name);} else {$ function ($ this-> imageResource);} return true ;} else {exit ('the image cannot be created because the image source is not set. ') ;}}/* free resource */function free () {if (is_resource ($ this-> imageResource) {@ imagedestroy ($ this-> imageResource );} if (is_resource ($ this-> target) {@ imagedestroy ($ this-> target) ;}}}?>