$validDate
"); ?>

= 0 && $h < 24 && $m >= 0 && $m < 60 && $s >= 0 && $s < 60; } ?> function checktime($h, $m, $s) {
  return $h >= 0 && $h < 24 && $m >= 0 && $m < 60 && $s >= 0 && $s < 60;
} A statement that calls the custom function:

"); $valid_time = checktime(12, 30, 0); echo('$valid_time = checktime(12, 30, 0); // returns ' . $valid_time . " (1 = true; 0 = false)

"); ?>