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You have to make filter like this way

`$filterVariable = array(460,4,98);

$this->_productCollection ->addFieldToFilter('entity_id',array('in'=> $filterVariable ));`

Means you have to make an array variable like this

$myarray = array(); foreach($productIds as $_productId) { $myarray[] = $_productId; } $this->_productCollection ->addFieldToFilter('entity_id',array('in'=> $myarray));

Let me know if face any other issue.