function _deprecated_constructor( $class, $version, $parent_class = '' ) {

  
/**
 * Fires when a deprecated constructor is called.
 *
 * @since 4.3.0
 * @since 4.5.0 Added the `$parent_class` parameter.
 *
 * @param string $class        The class containing the deprecated constructor.
 * @param string $version      The version of WordPress that deprecated the function.
 * @param string $parent_class The parent class calling the deprecated constructor.
 */
  do_action( 'deprecated_constructor_run', $class, $version, $parent_class );

  
/**
 * Filters whether to trigger an error for deprecated functions.
 *
 * `WP_DEBUG` must be true in addition to the filter evaluating to true.
 *
 * @since 4.3.0
 *
 * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
 */
  if ( WP_DEBUG && apply_filters( 'deprecated_constructor_trigger_error', true ) ) {
    if ( function_exists( '__' ) ) {
      if ( ! empty( $parent_class ) ) {
        trigger_error(
          sprintf(
            /* translators: 1: PHP class name, 2: PHP parent class name, 3: Version number, 4: __construct() method. */
            __( 'The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.' ),
            $class,
            $parent_class,
            $version,
            '<code>__construct()</code>'
          ),
          E_USER_DEPRECATED
        );
      } else {
        trigger_error(
          sprintf(
            /* translators: 1: PHP class name, 2: Version number, 3: __construct() method. */
            __( 'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ),
            $class,
            $version,
            '<code>__construct()</code>'
          ),
          E_USER_DEPRECATED
        );
      }
    } else {
      if ( ! empty( $parent_class ) ) {
        trigger_error(
          sprintf(
            'The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.',
            $class,
            $parent_class,
            $version,
            '<code>__construct()</code>'
          ),
          E_USER_DEPRECATED
        );
      } else {
        trigger_error(
          sprintf(
            'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.',
            $class,
            $version,
            '<code>__construct()</code>'
          ),
          E_USER_DEPRECATED
        );
      }
    }
  }

}