2Traversable (Traversal) interface

    
    $obj = new stdclass();$obj->prop = 'hello';var_dump($objinstanceof Traversable); // false

foreach 进行遍历的接口。php代码中不能用。只有内部的PHP类（用C写的类）才可以直接实现Traversable接口php代码中使用Iterator或IteratorAggregate接口来实现遍历。这个接口没有任何方法，它的作用仅仅是作为所有可遍历类的基本接口

'). addclass (' pre-numbering '). Hide (); $ (this). addclass (' has-numbering '). Parent (). append ($numbering); for (i = 1; i <= lines; i++) {$numbering. Append ($ ('

'). Text (i)); }; $numbering. FadeIn (1700); }); });

The above describes the 2Traversable (traversal) interface, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

