foo.php

<?php
class RowValidator 
{
    private $data;
    private $filter;
    private $errors;
    
    public function __construct($inputFilterInterface, $data)
    {
        $this->filter = $inputFilterInterface;
        $this->data   = $data;
    }
    
    public function validate()
    {
        foreach ($data as $singleEntry) {
            $validator->setData($singleEntry);
            
            if (false === $validator->isValid()) {
                $this->errors[$singleEntry['id']] = $validator->getMessages();
            }
        }
        
        return ! (bool) count($this->errors);
    }
    
    public function getErrorMessages()
    {
        return $this->errors;
    }
}