class test
    {
        public $test = array();
        
        function test()
        {
            $this -> test[] = 'ok';
        }

        function _echo()
        {
            foreach ($this -> test as $val)
                echo print_r($val);
        }
        
    }

    $test = new test();
    $test -> _echo();

echo print_r($var,true);

------解决方案--------------------
1 是print_r()函数的返回值