gistfile1.txt

/**     
*  Sanitize Request variables     
*/   
public function sanitize($input)    {
  foreach ($input as $key => $value) {
    if ($value) {                
      $input[$key] = filter_var($input[$key], FILTER_SANITIZE_STRING);
      $input[$key] = preg_replace('/[^a-z0-9]/i', '', $input[$key]);
    }        
  }       
  return $input;    
}