[WordPress] Temporary Options in WordPress

00-init.php

<?php

public function init() {

	add_action(
		'update_option',
		array( $this, 'manage_temporary_option' ),
		10, 3
	);
}

01-manage-temporary-option.php

<?php

public function manage_temporary_option( $option_name, $old_value, $new_value ) {

	if ( 'an_irrelevant_option' !== $option_name ) {
		return;
	}

	$url = 'page-from-which-we-expect-to-come.php';
	if ( $url === $_SERVER['REQUEST_URI'] ) {

		update_option(
			'our_temporary_option',
			$new_value
		);
	}
}