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$url = 'https://img-bbs.csdn.net/upload/201511/22/1448188988_283004.png';
$src = imagecreatefrompng($url);
$im = imagecreatetruecolor(180, 230);
imagecopy($im, $src, 0, 0, 20, 300, imagesx($im), imagesy($im));
$ar = array(0,0, 0,240, 180,240, 180,0, 0,0, 10,10, 30,200, 150,120, 110,20, 10,10);
$c = imagecolorallocate($im, 0, 0, 0);
imagefilledpolygon($im, $ar, count($ar)/2, $c);
imagecolortransparent($im, $c);
imagegif($im);