How the character code in PHP

I known i can get the ASCII code of an character using ord() but i want to encode a string like %45,%20, so i need the HEX code or however it's called

 

rawurlencode()

 

that do not encrypt the string, only the special characters from the string!

 

This should do what you want.

function str_to_hex($string)
{
	$hex = '';
	$len = strlen($string);
	
	for ($i = 0; $i < $len; $i++)
	{
		$hex .= '%' . str_pad(dechex(ord($string[$i])), 2, 0, STR_PAD_LEFT);
	}
	
	return $hex;
}

PHP:

 

One more question , how i can do the reverse of this!?

 

In keeping with nico's scheme of things

function hex_to_str($hex)
{
	$string = '';
	$data = explode('%',$hex);
	$len = count($data);
	for ($i=1; $i < $len; $i++)	// yes, ONE.  skip first array element, which is empty
			$string .= chr(hexdec($data[$i]));
	return $string;
}

PHP: