<br /> /** rotate a string, use for simple encoding */<br /> function rotateString($pInput,$pRotateNum=0) {<br /> $vOutput = ”;<br /> $vStr = ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890|’;<br /> $vLen = strlen($vStr);<br /> for ($i=0;$i<strlen($pInput);$i++) {<br /> $vIndex = strpos($vStr,$pInput{$i});<br /> if ($vIndex===FALSE) { // non-encode chars, leave these alone<br /> $vOutput .= $pInput{$i};<br /> } else {<br /> $vIndex = $vIndex+$pRotateNum;<br /> $vIndex = $vIndex>0?$vIndex%$vLen:($vLen+$vIndex)%$vLen;<br /> $vOutput .= $vStr{$vIndex};<br /> } // fi<br /> } // rof<br /> //var_dump($vOutput);<br /> return $vOutput;<br /> }<br />

Usage

$a = rotateString($b,19); // encode
$b = rotateString($a,-19); // decode