wp_enqueue_script( 'autosave' );
+if ( is_multisite() ) {
+ add_action( 'admin_footer', '_admin_notice_post_locked' );
+} else {
+ $check_users = get_users( array( 'fields' => 'ID', 'number' => 2 ) );
+
+ if ( count( $check_users ) > 1 )
+ add_action( 'admin_footer', '_admin_notice_post_locked' );
+
+ unset( $check_users );
+}
+
// Show post form.
$post = get_default_post_to_edit( $post_type, true );
$post_ID = $post->ID;