PHP watermark Code, PHP translucent watermark support PNG transparent background

Original image $DST = "/upload/20140914/20120914040740-0.jpg"; Picture path Original picture information $DST _info = getimagesize ($DST); Switch ($DST _info[2]) { Case 1: $DST _im =imagecreatefromgif ($DST); Case 2: $DST _im =imagecreatefromjpeg ($DST); Case 3: $DST _im =imagecreatefrompng ($DST); Case 6: $DST _im =imagecreatefromwbmp ($DST); Default Die ("Unsupported file type 1"); exit; } Watermark Image $SRC = "/images/shuiyin.png"; Note the path to write to $src _info = getimagesize ($SRC); Switch ($src _info[2]) { Case 1: $SRC _im =imagecreatefromgif ($SRC); Case 2: $SRC _im =imagecreatefromjpeg ($SRC); Case 3: $SRC _im =imagecreatefrompng ($SRC); Case 6: $SRC _im =imagecreatefromwbmp ($SRC); Default Die ("Unsupported file type 1"); exit; } Translucent format watermark $alpha = 50; Watermark Transparency Imagecopymerge ($dst _im, $src _im, $dst _info[0]-$src _info[0]-10, $dst _info[1]-$src _info[1]-10,0,0, $src _info[0],$ SRC_INFO[1], $alpha); Ways to support PNG's own transparency Imagecopy ($dst _im, $src _im, $dst _info[0]-$src _info[0]-10, $dst _info[1]-$src _info[1]-10,0,0, $src _info[0], $src _info [1]); Save picture Switch ($DST _info[2]) { Case 1: Imagegif ($dst _im, $DST); Case 2: Imagejpeg ($dst _im, $DST); Case 3: Imagepng ($dst _im, $DST); Case 6: Imagewbmp ($dst _im, $DST); Default Die ("Unsupported file type 2"); exit; } Destroying the GD library object Imagedestroy ($dst _im); Imagedestroy ($src _im); Copy Code

