PHP code to upload images and add transparent watermarks

$im = imagecreatefromjpeg($_file["upload"]["tmp_name"]); //You want to draw a picture of the water example
$watermark = imagecreatefrompng("Smiley.png") ; //The path of the watermark image
$im_x = imagesx($im);
$im_y = imagesy($im);
$w_x = imagesx($watermark);
$w_y = imagesy($watermark);
imagecopy( $im,$watermark ,$im_x-$w_x,$im_y-$w_y,0,0,$w_x,$w_y);
imagejpeg($im); //You can add a path to save the image with watermark
/ /You can use type to determine the image type
//switch($_file["upload"]["type"])
//case:1
//Then use different functions
//imagejpeg() to correspond to jpeg
/ /imagegif() corresponds to gif
//imagepng() corresponds to png
imagedestroy($im);