Rot13 Extended

<?php
/**
*@description: ROT13 algorithm to encrypt/decrypt strings with one single function
*/


function rot13Modified ($str) {
	
	
	$MNLTTRASCII = 97;
	// min letter ascii
	$MXLTTRASCII = 122;
	// max letter ascii
	$MNCLTTRASCII = 65;
	// min capital letter ascii
	$MXCLTTRASCII = 90;
	// max capital letter ascii
	$MNNRASCII = 48;
	// min number ascii
	$MXNRASCII = 57;
	// max number ascii
	
	$special = array();
	$special['@'] = "_";
	$special['.'] = "-";
	$special[' '] = "$";
	$special['/'] = '\\';
	
	$new = "";
	
	for ($i = 0; $i < strlen($str); $i++) {
		if (($MNNRASCII <= ord($str[$i])) && (ord($str[$i]) <= $MXNRASCII)) {
	 		// numeric
	 		$nr = ord($str[$i]) + (($MXNRASCII - $MNNRASCII + 1) / 2);
	 		// (($MXNRASCII - $MNNRASCII + 1) / 2) = half of total numbers
	 		if ($nr > $MXNRASCII) {
	 			$diff = $nr % $MXNRASCII;
	 			$nr = $MNNRASCII - 1 + $diff;
	 		}
	 	} else if (($MNLTTRASCII <= ord($str[$i])) && (ord($str[$i]) <= $MXLTTRASCII)) {
			// lowercase letter
			$nr = ord($str[$i]) + (($MXLTTRASCII - $MNLTTRASCII + 1) / 2);;
			if ($nr > $MXLTTRASCII) {
				$diff = $nr % $MXLTTRASCII;
				$nr = $MNLTTRASCII - 1 + $diff;
			}
		} else if (($MNCLTTRASCII <= ord($str[$i])) && (ord($str[$i]) <= $MXCLTTRASCII)) {
			// capital letter
			$nr = ord($str[$i]) + (($MXCLTTRASCII - $MNCLTTRASCII + 1) / 2);;
			if ($nr > $MXCLTTRASCII) {
				$diff = $nr % $MXCLTTRASCII;
				$nr = $MNCLTTRASCII - 1 + $diff;
			}
		} else if (array_key_exists($str[$i], $special)) {
			// maybe it exists as key in the special token array
			$nr = ord($special[$str[$i]]);
			// set the value of the key as number (ascii)
		} else if (in_array($str[$i], $special)) {
			// maybe it exists as value in the special token array - opposite of the previous else if
			$tmp = array_flip($special);
			$nr = ord($tmp[$str[$i]]);
		}
		$new .= chr($nr);
	}
	
	$new = strrev($new);
	// reverse the string - not necessary, but this will blow their (hacking) socks off...
	
	return $new;
}


?>

<?php
/**
*@description: ROT13 algorithm to encrypt/decrypt strings with one single function
*/
 
 
function rot13Modified ($str) {
 
 
	$MNLTTRASCII = 97;
	// min letter ascii
	$MXLTTRASCII = 122;
	// max letter ascii
	$MNCLTTRASCII = 65;
	// min capital letter ascii
	$MXCLTTRASCII = 90;
	// max capital letter ascii
	$MNNRASCII = 48;
	// min number ascii
	$MXNRASCII = 57;
	// max number ascii
 
	$special = array();
	$special['@'] = "_";
	$special['.'] = "-";
	$special[' '] = "$";
	$special['/'] = '\\';
 
	$new = "";
 
	for ($i = 0; $i < strlen($str); $i++) {
		if (($MNNRASCII <= ord($str[$i])) && (ord($str[$i]) <= $MXNRASCII)) {
	 		// numeric
	 		$nr = ord($str[$i]) + (($MXNRASCII - $MNNRASCII + 1) / 2);
	 		// (($MXNRASCII - $MNNRASCII + 1) / 2) = half of total numbers
	 		if ($nr > $MXNRASCII) {
	 			$diff = $nr % $MXNRASCII;
	 			$nr = $MNNRASCII - 1 + $diff;
	 		}
	 	} else if (($MNLTTRASCII <= ord($str[$i])) && (ord($str[$i]) <= $MXLTTRASCII)) {
			// lowercase letter
			$nr = ord($str[$i]) + (($MXLTTRASCII - $MNLTTRASCII + 1) / 2);;
			if ($nr > $MXLTTRASCII) {
				$diff = $nr % $MXLTTRASCII;
				$nr = $MNLTTRASCII - 1 + $diff;
			}
		} else if (($MNCLTTRASCII <= ord($str[$i])) && (ord($str[$i]) <= $MXCLTTRASCII)) {
			// capital letter
			$nr = ord($str[$i]) + (($MXCLTTRASCII - $MNCLTTRASCII + 1) / 2);;
			if ($nr > $MXCLTTRASCII) {
				$diff = $nr % $MXCLTTRASCII;
				$nr = $MNCLTTRASCII - 1 + $diff;
			}
		} else if (array_key_exists($str[$i], $special)) {
			// maybe it exists as key in the special token array
			$nr = ord($special[$str[$i]]);
			// set the value of the key as number (ascii)
		} else if (in_array($str[$i], $special)) {
			// maybe it exists as value in the special token array - opposite of the previous else if
			$tmp = array_flip($special);
			$nr = ord($tmp[$str[$i]]);
		}
		$new .= chr($nr);
	}
 
	$new = strrev($new);
	// reverse the string - not necessary, but this will blow their (hacking) socks off...
 
	return $new;
}
 
 
?>