php图片叠加

单图片

//图片叠加

function imagealphaMerge($dst,$src,$d_x,$d_y,$s_x,$s_y,$s_w,$s_h,$alpha){
    $dst_im = imagecreatefromjpeg($dst);
    $src_im = imagecreatefromjpeg($src);
    imagecopymerge($dst_im,$src_im,$d_x,$d_y,$s_x,$s_y,$s_w,$s_h,$alpha);
    imagejpeg($dst_im);
    imagedestroy($dst_im);
    imagedestroy($src_im);
}
imagealphaMerge('Chrysanthemum.jpg',$src,0,0,0,0,300,300,50);

多图片

$src = array('Koala.jpg','Tulips.jpg');
function imagealphaMerge($dst,$src,$d_x,$d_y,$s_x,$s_y,$s_w,$s_h,$alpha){
	 $dst_im = imagecreatefromjpeg($dst);
	 $num = count($src);
	 for ($i=0; $i<$num; $i++)
	 {
		$src_im = imagecreatefromjpeg($src[$i]);
		imagecopymerge($dst_im,$src_im,$d_x,$d_y,$s_x,$s_y,$s_w,$s_h,$alpha);
	 }
	 imagejpeg($dst_im);
	 imagedestroy($dst_im);
　　　　　imagedestroy($src_im);
 }
 imagealphaMerge('Chrysanthemum.jpg',$src,0,0,0,0,300,300,50);

这里是用jpg图片做的测试，如果其他图片请更换imagecreatefromjpeg,imagejpeg。同时修改图片路径