#concrete5 Check if the block is private or not

block_view.php

<?php
// for concrete5.6
// libraries/block_view.php
defined('C5_EXECUTE') or die("Access Denied.");

class BlockView extends Concrete5_Library_BlockView {
    
    public function render($obj, $view = 'view', $args = array()) {
        $isPrivate = true;
        $pk = PermissionKey::getByHandle('view_block');
        $pk->setPermissionObject($obj);
        $pa = $pk->getPermissionAccessObject();
        if (is_object($pa)) {
        	$pe = GroupPermissionAccessEntity::getOrCreate(Group::getByID(GUEST_GROUP_ID));
        	$ae = array($pe);
        	if ($pa->validateAccessEntities($ae)) {
        		$isPrivate = false;
        	}
        }
        
        if ($isPrivate) {
            echo '<div class="private">';
        }
        
        parent::render($obj, $view, $args);
        
        if ($isPrivate) {
            echo '</div>';
        }
    }
    
}