[SOLVED] encoding cookies?

[droopz17]

I have searched far and low for a way to encode my cookies and then decode them. I can't find crap. So i'm curious if a function like the one i wrote real quick below would work at all, and then i'll make one simular to it to decode the cookie.

 

create function encode($var){

$out_var = '';
$s = '0';
$e = '1';

$num_char = strlen($var);

//WHILE NUMBER OF CHARACHTERS IS LESS THE THE NUMBER OF I
while( $num_char < $i ){
	$new_var = substr($var, $s, $e )

	if( $new_var == a ){
		$out_var .= '05';

	}elseif( $new_var == b ){

		$out_var .= '18';

	}elseif( $new_var == c ){

		$out_var .= '06';

	}elseif( $new_var == d ){

		$out_var .= '19';

	}elseif( $new_var == e ){

		$out_var .= '07';

	}elseif( $new_var == f ){

		$out_var .= '20';

	}elseif( $new_var == g ){

		$out_var .= '08';

	}elseif( $new_var == h ){

		$out_var .= '21';

	}elseif( $new_var == i ){

		$out_var .= '09';

	}elseif( $new_var == j ){

		$out_var .= '22';

	}elseif( $new_var == k ){

		$out_var .= '10';

	}elseif( $new_var == l ){

		$out_var .= '23';

	}elseif( $new_var == m ){

		$out_var .= '11';

	}elseif( $new_var == n ){

		$out_var .= '24';

	}elseif( $new_var == o ){

		$out_var .= '12';

	}elseif( $new_var == p ){

		$out_var .= '25';

	}elseif( $new_var == q ){

		$out_var .= '13';

	}elseif( $new_var == r ){

		$out_var .= '26';

	}elseif( $new_var == s ){

		$out_var .= '14';

	}elseif( $new_var == t ){

		$out_var .= '01';

	}elseif( $new_var == u ){

		$out_var .= '15';

	}elseif( $new_var == v ){

		$out_var .= '02';

	}elseif( $new_var == w ){

		$out_var .= '16';

	}elseif( $new_var == x ){

		$out_var .= '03';

	}elseif( $new_var == y ){

		$out_var .= '17';

	}elseif( $new_var == z ){

		$out_var .= '04';

	}else{
		echo 'encoding did not work.'
		exit;
	}					

	$s++;
	$e++;
$i++
}
return $out_var;

}

 

now i'm sure theres some errors in there but i'm at work so it's just a quick idea, and i need to know somehting like this would work.