[PHP] Validate date PHP function with date format. Return true if valid date and other side.

validateDate.php

<?php 
  /**
   * Valid datetime format
   *
   * @param string $date
   * @param string $format
   * @return bool
   */
  private function validate_date($date, $format = 'Y/m/d')
  {
      $d = DateTime::createFromFormat($format, $date);
      return $d && $d->format($format) === $date;
  }