URL Decoding

Decodes URL-encoded string

• C#
• VB.Net
• C
• C++
• PHP

									function HexadecimalToDecimal($hex) {
	$hex = strtoupper($hex);

	$hexLength = strlen($hex);
	$dec = 0.0;

	for ($i = 0; $i < $hexLength; $i++)
	{
		$b = ord($hex[$i]);
		
		if ($b >= 48 && $b <= 57)
			$b -= 48;
		else if ($b >= 65 && $b <= 70)
			$b -= 55;

		$dec += $b * pow(16, (($hexLength - $i) - 1));
	}

	return (int)$dec;
}

function DecodeURL($data, $count) {
	$j = 0;

	for ($i = 0; $i < $count; $i++, $j++)
	{
		if ($data[$i] == '%')
		{
			$h = $data[$i + 1] . $data[$i + 2];
			$result[$j] = chr(HexadecimalToDecimal($h));
			$i += 2;
		}
		else
		{
			$result[$j] = $data[$i];
		}
	}

	return implode("", $result);
}
								

Example

									$data = "jdfgsdhfsdfsd%206445dsfsd7fg%2F%2A%2F%2Bbfjsdgf%25%24%5E";
$value = DecodeURL($data, strlen($data));
								

Output

									jdfgsdhfsdfsd 6445dsfsd7fg/*/+bfjsdgf%$^