Tech Tips & Tricks

PHP Encrypt Decrypt using Base64

Here are two methods to encrypt and decrypt using Base64. I forgot where I got this from but these 2 methods are pretty handy. Make sure you remember your key as your string will be encrypted and decrypted according to what you specify as key. Key is a string here.

Usage is as follows:
$encrypted = encrypt("to encrypt string", "chitgoks");
$decrypted = decrypt($encrypted, "chitgoks");

$decrypted will return to encrypt string.

function encrypt($string, $key) {
  $result = '';
  for($i=0; $i<strlen($string); $i++) {
    $char = substr($string, $i, 1);
    $keychar = substr($key, ($i % strlen($key))-1, 1);
    $char = chr(ord($char)+ord($keychar));
    $result.=$char;
  }

  return base64_encode($result);
}

function decrypt($string, $key) {
  $result = '';
  $string = base64_decode($string);

  for($i=0; $i<strlen($string); $i++) {
    $char = substr($string, $i, 1);
    $keychar = substr($key, ($i % strlen($key))-1, 1);
    $char = chr(ord($char)-ord($keychar));
    $result.=$char;
  }

  return $result;
}


PHP Delete directory

Deletes a directory in the server’s file system.

function deleteDirectory($dir, $DeleteMe) {
  if(!$dh = @opendir($dir)) return;
  while (false !== ($obj = readdir($dh))) {
    if($obj=='.' || $obj=='..') continue;
    if (!@unlink($dir.'/'.$obj)) SureRemoveDir($dir.'/'.$obj, true);
  }
  closedir($dh);
  if ($DeleteMe){
  @rmdir($dir);
}


PHP Create directory

Creates a directory in the server’s file system.

function makeDirectory($path) {
  if (!is_dir($path)) {
    $oldumask = umask(0);
    mkdir($path, 0777);
    umask($oldumask);
    chmod($path, 0777); // octal; correct value of mode
  }
}