function _deprecated_hook( $hook, $version, $replacement = null, $message = null ) {
	/**
	 * Fires when a deprecated hook is called.
	 *
	 * @since 4.6.0
	 *
	 * @param string $hook        The hook that was called.
	 * @param string $replacement The hook that should be used as a replacement.
	 * @param string $version     The version of WordPress that deprecated the argument used.
	 * @param string $message     A message regarding the change.
	 */
	do_action( 'deprecated_hook_run', $hook, $replacement, $version, $message );

	/**
	 * Filters whether to trigger deprecated hook errors.
	 *
	 * @since 4.6.0
	 *
	 * @param bool $trigger Whether to trigger deprecated hook errors. Requires
	 *                      `WP_DEBUG` to be defined true.
	 */
	if ( WP_DEBUG && apply_filters( 'deprecated_hook_trigger_error', true ) ) {
		$message = empty( $message ) ? '' : ' ' . $message;
		if ( ! is_null( $replacement ) ) {
			/* translators: 1: WordPress hook name, 2: Version number, 3: Alternative hook name. */
			trigger_error( sprintf( __( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ), $hook, $version, $replacement ) . $message );
		} else {
			/* translators: 1: WordPress hook name, 2: Version number. */
			trigger_error( sprintf( __( '%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.' ), $hook, $version ) . $message );
		}
	}
}