wp_update_lock_down() │ WPSCache 1.0

No Hooks.

Returns

null. Nothing (null).

Usage

wp_update_lock_down();

wp_update_lock_down() code WPSCache 3.0.0

wp-super-cache/wp-cache.php 
function wp_update_lock_down() {
	global $cache_path, $wp_cache_config_file, $valid_nonce;

	if ( isset( $_POST[ 'wp_lock_down' ] ) && $valid_nonce ) {
		$wp_lock_down = $_POST[ 'wp_lock_down' ] == '1' ? '1' : '0';
		wp_cache_replace_line( '^.*WPLOCKDOWN', "if ( ! defined( 'WPLOCKDOWN' ) ) define( 'WPLOCKDOWN', '$wp_lock_down' );", $wp_cache_config_file );
		if ( false == defined( 'WPLOCKDOWN' ) )
			define( 'WPLOCKDOWN', $wp_lock_down );
		if ( $wp_lock_down == '0' && function_exists( 'prune_super_cache' ) )
			prune_super_cache( $cache_path, true ); // clear the cache after lockdown
		return $wp_lock_down;
	}
	if ( defined( 'WPLOCKDOWN' ) )
		return constant( 'WPLOCKDOWN' );
	else
		return 0;
}