wp_ajax_update_welcome_panel() WordPress Function

function wp_ajax_update_welcome_panel() {
	check_ajax_referer( 'welcome-panel-nonce', 'welcomepanelnonce' );

	if ( ! current_user_can( 'edit_theme_options' ) ) {
		wp_die( -1 );
	}

	update_user_meta( get_current_user_id(), 'show_welcome_panel', empty( $_POST['visible'] ) ? 0 : 1 );

	wp_die( 1 );
}
Uses	Description
wp-includes/capabilities.php:current_user_can()	Returns whether the current user has the specified capability.
wp-includes/pluggable.php:check_ajax_referer()	Verifies the Ajax request to prevent processing requests external of the blog.
wp-includes/functions.php:wp_die()	Kills WordPress execution and displays HTML page with an error message.
wp-includes/user.php:update_user_meta()	Updates user meta field based on user ID.
wp-includes/user.php:get_current_user_id()	Gets the current user’s ID.