GD imagelayereffect met 2 image resources (Opgelost)

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

$im = imagecreatetruecolor(100, 100);
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im,255, 0, 0));

$gradient = imagecreatetruecolor(100, 100);
imagecolorgradient($gradient, 0, 0, 100, 100, array(255, 255, 255), array(0, 0, 0));

imagelayereffect($im, IMG_EFFECT_NORMAL);
imagecopy($im, $gradient, 0,0,0,0,100,100);

imagedestroy($gradient);

imagepng($im);
imagedestroy($im);


function imagecolorgradient($im, $x1, $y1, $height, $width, $left_color, $right_color)
{
    $color0=($left_color[0]-$right_color[0])/$width;
    $color1=($left_color[1]-$right_color[1])/$width;
    $color2=($left_color[2]-$right_color[2])/$width;
    for ($i=0;$i<=$width;$i++)
    {
        $red=$left_color[0]-floor($i*$color0);
        $green=$left_color[1]-floor($i*$color1);
        $blue=$left_color[2]-floor($i*$color2);
        $col= imagecolorallocate($im, $red, $green, $blue);
        imageline($im, $x1+$i, $y1, $x1+$i, $y1+$height, $col);
    }
}

header('Content-type: image/png');
 
$im = imagecreatetruecolor(100, 100);
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im,255, 0, 0));
 
$gradient = imagecreatetruecolor(100, 100);
imagecolorgradient($gradient, 0, 0, 100, 100, array(255, 255, 255), array(0, 0, 0));
 
imagelayereffect($im, IMG_EFFECT_NORMAL);
imagecopy($im, $gradient, 0,0,0,0,100,100);
 
imagedestroy($gradient);
 
imagepng($im);
imagedestroy($im);
 
 
function imagecolorgradient($im, $x1, $y1, $height, $width, $left_color, $right_color)
{
    $color0=($left_color[0]-$right_color[0])/$width;
    $color1=($left_color[1]-$right_color[1])/$width;
    $color2=($left_color[2]-$right_color[2])/$width;
    for ($i=0;$i<=$width;$i++)
    {
        $red=$left_color[0]-floor($i*$color0);
        $green=$left_color[1]-floor($i*$color1);
        $blue=$left_color[2]-floor($i*$color2);
        $col= imagecolorallocate($im, $red, $green, $blue);
        imageline($im, $x1+$i, $y1, $x1+$i, $y1+$height, $col);
    }
}