Create Random Number

function generate_osid($length)
{
	$rand = '';

	for($i = 0; $i < $length; $i++)
	{
		$number = mt_rand(0, 61);

		if($number < 10)
		{
			$rand .= chr($number + 48);
		}
		elseif($randnum < 36)
		{
			$rand .= chr($number + 55);
		}
		else
		{
			$rand .= chr($number + 61);
		}
	}

	return $rand;
}