Simple example of adding a watermark to a php image

Simple example of adding a watermark to a php image

/** * Watermarks images (for png, jpg, and gif formats) * * @ Author flynetcn * * @ Param $ srcImg original image * @ Param $ waterImg watermark image * @ Param $ savepath: save path * @ Param $ savename save the name * @ Param $ position of the positon watermark * 1: Top left, 2: top right, 3: center, 4: bottom left, 5: bottom right * @ Param $ alpha transparency -- 0: completely transparent, 100: completely opaque * * @ Return success -- the new image address after the watermark is added * Failed ---1: The original file does not exist.-2: The watermark image does not exist.-3: The original file Image object creation failed. *-4: failed to create the watermark File Image object-5: failed to save the new image after adding the watermark */ Function img_water_mark ($ srcImg, $ waterImg, $ savepath = null, $ savename = null, $ positon = 5, $ alpha = 30) { $ Temp = pathinfo ($ srcImg ); $ Name = $ temp ['basename']; $ Path = $ temp ['dirname']; $ Exte = $ temp ['extension']; $ Savename = $ savename? $ Savename: $ name; $ Savepath = $ savepath? $ Savepath: $ path; $ Savefile = $ savepath. '/'. $ savename; $ Srcinfo = @ getimagesize ($ srcImg ); If (! $ Srcinfo ){ Return-1; // The original file does not exist. } $ Waterinfo = @ getimagesize ($ waterImg ); If (! $ Waterinfo ){ Return-2; // The watermark image does not exist. } $ SrcImgObj = image_create_from_ext ($ srcImg ); If (! $ SrcImgObj ){ Return-3; // failed to create the original file Image object } $ WaterImgObj = image_create_from_ext ($ waterImg ); If (! $ WaterImgObj ){ Return-4; // watermark File Image object creation failed } Switch ($ positon ){ // 1 top left Case 1: $ x = $ y = 0; break; // 2. top right Case 2: $ x = $ srcinfo [0]-$ waterinfo [0]; $ y = 0; break; // 3 center Case 3: $ x = ($ srcinfo [0]-$ waterinfo [0])/2; $ y = ($ srcinfo [1]-$ waterinfo [1]) /2; break; // 4 the bottom is left Case 4: $ x = 0; $ y = $ srcinfo [1]-$ waterinfo [1]; break; // 5 bottom right Case 5: $ x = $ srcinfo [0]-$ waterinfo [0]; $ y = $ srcinfo [1]-$ waterinfo [1]; break; Default: $ x = $ y = 0; } Imagecopymerge ($ srcImgObj, $ waterImgObj, $ x, $ y, 0, 0, $ waterinfo [0], $ waterinfo [1], $ alpha ); Switch ($ srcinfo [2]) { Case 1: imagegif ($ srcImgObj, $ savefile); break; Case 2: imagejpeg ($ srcImgObj, $ savefile); break; Case 3: imagepng ($ srcImgObj, $ savefile); break; Default: return-5; // save failed } Imagedestroy ($ srcImgObj ); Imagedestroy ($ waterImgObj ); Return $ savefile; } Function image_create_from_ext ($ imgfile) { $ Info = getimagesize ($ imgfile ); $ Im = null; Switch ($ info [2]) { Case 1: $ im = imagecreatefromgif ($ imgfile); break; Case 2: $ im = imagecreatefromjpeg ($ imgfile); break; Case 3: $ im = imagecreatefrompng ($ imgfile); break; } Return $ im; }