foreach ($_POST as $key=>$value) {
  if ($key ==="Single Names") {
    if (ctype_alpha($value)){
      $clean[$key] = strip_tags(strtolower(stripslashes($value)));
    }
  }
  if ($key ==="Addresses") {
    if (ctype_alnum($value)){
      $clean[$key] = strip_tags(strtolower(stripslashes($value)));
    }
  }
  if ($key ==="Numbers") {
    if (ctype_digit($value)){
      $clean[$key] = strip_tags(strtolower(stripslashes($value)));
    }
  }
  if ($key ==="Amounts") {
    if (is_float($value)){
      $clean[$key] = strip_tags(strtolower(stripslashes($value)));
    }
  }
}

Select all