scene
the first picture 500X500, the middle area is "copyright" and the rest is transparent;
the second picture is all transparent.
purpose
try to make the word "copyright" transparent.
now use the imagecopymerge function to merge the two images, and the resulting image is black.
$qr_bg_img_info = getimagesize($qr_bg_tpl);
$w = $qr_bg_img_info[0];
$h = $qr_bg_img_info[1];
// set our RGB value from above to be transparent and merge the images with the specified opacity
$color = imagecolorallocate($dst_img, 255, 0, 0);
imagearc($dst_img, $w/2, $h/2, $w, $h, 0, 360, $color);
imagefilltoborder($dst_img, 0, 0, $color, $color);
imagefilltoborder($dst_img, $w, 0, $color, $color);
imagefilltoborder($dst_img, 0, $h, $color, $color);
imagefilltoborder($dst_img, $w, $h, $color, $color);
imagecolortransparent($dst_img, $color);
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