lithium\storage\cache\adapter\File::read PHP Method

    public function read(array $keys)
    {
        if ($this->_config['scope']) {
            $keys = $this->_addScopePrefix($this->_config['scope'], $keys, '_');
        }
        $results = array();
        foreach ($keys as $key) {
            if (!($item = $this->_read($key))) {
                continue;
            }
            if ($item['expiry'] < time() && $item['expiry'] != 0) {
                $this->_delete($key);
                continue;
            }
            $results[$key] = $item['value'];
        }
        if ($this->_config['scope']) {
            $results = $this->_removeScopePrefix($this->_config['scope'], $results, '_');
        }
        return $results;
    }

 public function testIncrementWithScope()
 {
     $adapter = new File(array('scope' => 'primary'));
     $this->File->write(array('primary_key1' => 5));
     $this->File->write(array('key1' => 10));
     $expected = 6;
     $result = $adapter->increment('key1');
     $this->assertEqual($expected, $result);
     $expected = array('key1' => 6);
     $result = $adapter->read(array('key1'));
     $this->assertEqual($expected, $result);
 }