May be this hook is used after post ad
osc_add_hook('posted_item', 'check_item_spam');

function check_item_spam($xyz) {
   
    if ($is_spam) {
    // Code to be executed if the condition is true
    Set item value to spam ( ad not live)
} else {
    // Code to be executed if the condition is false.
  Set value is not spam(ad will live on site)
}
   
}

Need help, how to set based on this example. Set value if item is spam of posted item.

You can use itemactions

$manager = new ItemActions(false);
$manager->spam($item_id, true);


Thankyou so much, working.