PHP GD将图像设置在透明图像后面

Question

I need to put one image behind another image which is transparent. Another way of explaining this is changing the priority of what is shown first. Perhaps a layer? My code puts background (bg.png) on top/in front of the transparent image (sig.png):

header( 'Content-Type: image/png' );

$im = imagecreatefromstring( file_get_contents( 'public/sig.png' ) );

imagealphablending( $im, true );

imagesavealpha( $im, true );

$temp = imagecreatefromstring( file_get_contents( 'public/bg.png' ) );

imagecopy( $im, $temp, 34, 88, 0, 0, 850, 300 );

imagepng( $im );

imagedestroy( $im );

Answer 1

Switching the first two parameters in your call to imagecopy will fix the draw order (you might need to update the other parameters too):

imagecopy($temp, $im, 34, 88, 0, 0, 850, 300);
imagepng($temp);

As stated in the manual , imagecopy can be used to:

Copy a part of src_im onto dst_im ...

src_im is the second parameter, dst_im is the first parameter.

Answer 2

I created my custom image with transparent background as base and then merged two other images both background and main content together.

Thank you.