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<?php
function toQRCode($prefix, $str) {
	$prefixOrd = "";
	for ($i = 0; $i < strlen($prefix); $i++) {
		$c = substr($prefix, $i, 1);
		$prefixOrd.= dechex(ord($c));
	}
	return $prefixOrd.md5($str);
}

echo toQRCode("ABC", "Hello World!")."\n";
?>