getCode

private function getCode($s, $flag = false)
	{
		$retorno = '';
		$temp;
		$n;
		if (!$s || $s == '' || self::hasLetters($s) || $flag)
		{
			$retorno = '29871';
		}
		else
		{
			$n = strlen($s);
			if ($n > 9)
			{
				$temp = (string)$n;
				$n = (int)$temp[0] + (int)$temp[1];
			}
			$retorno .=  (string)$n;
			((int)substr($s, -1, 1) % 2 == 0)? $retorno .= '0' : $retorno .= '1';
			$n = 0;
			$temp = $s;
			for ($i = 0; $i < strlen($temp); $i++)
			{
				$n +=  (int)$temp[$i];
			}
			if ($n > 9)
			{
				$temp = (string)$n;
				$n = (int)$temp[0] + (int)$temp[1];
			}
			if ($n > 9)
			{
				$temp = (string)$n;
				$n = (int)$temp[0] + (int)$temp[1];
			}
			$retorno .=  (string)$n;
			if (strlen($s) == 1)
			{
				$retorno .=  '9';
			}
			else
			{
				if ((int)$s[0] > (int)substr($s, -1, 1))
				{
					$retorno .=  '7';
				}
				else if ((int)$s[0] < (int)substr($s, -1, 1))
				{
					$retorno .=  '3';
				}
				else
				{
					$retorno .=  '5';
				}
 
			}
		}
		return $retorno;
	}
 
	private function hasLetters($s)
	{
		for ($i = 0; $i < strlen($s); $i++)
		{
			if (ord(substr($s, $i, 1)) < 48 || ord(substr($s, $i, 1)) > 57)
			{
				return true;
			}
		}
		return false;
	}