你可以在这里检查示例输出http://wmh.github.io/hunbook/examples/gd-imagettftext.html

function imagettfstroketext(&$image,$size,$angle,$x,$y,&$textcolor,&$strokecolor,$fontfile,$text,$px) {
    for($c1 = ($x-abs($px)); $c1 <= ($x+abs($px)); $c1++)
        for($c2 = ($y-abs($px)); $c2 <= ($y+abs($px)); $c2++)
            $bg = imagettftext($image,$c1,$c2,$strokecolor,$text);
   return imagettftext($image,$textcolor,$text);
}