Runs just before PHP shuts down execution.

Source

function shutdown_action_hook() {
	/**
	 * Fires just before PHP shuts down execution.
	 *
	 * @since 1.2.0
	 */
	do_action( 'shutdown' );

	wp_cache_close();
}

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Hooks

do_action( ‘shutdown’ )

Fires just before PHP shuts down execution.

Changelog