function createRoundImg($imgpath) {

    $ext = pathinfo($imgpath);

    $src_img = null;

    switch ($ext['extension']) {

        case 'jpg':

            $src_img = imagecreatefromjpeg($imgpath);

            break;

        case 'png':

            $src_img = imagecreatefrompng($imgpath);

            break;

    }

    $wh = getimagesize($imgpath);

    $w  = $wh[0];

    $h  = $wh[1];

    $w = $h = min($w, $h);

    $image = imagecreatetruecolor($w, $h);

    $bg = imagecolorallocatealpha($image, 255, 255, 255, 127);

    imagesavealpha($image, true);

    imagefill($image, 0, 0, $bg);

    $r = $w / 2;

    for ($x = 0; $x < $w; $x++) {

        for ($y = 0; $y < $h; $y++) {

            $rgbColor = imagecolorat($src_img, $x, $y);

            if (((($x-$r) * ($x-$r) + ($y-$r) * ($y-$r)) < ($r*$r))) {

                imagesetpixel($image, $x, $y, $rgbColor);

            }

        }

    }

    header("content-type:image/png");

    imagepng($image);

    imagedestroy($image);

}