如在lambda函数的示例中所示，闭包的最明显用法之一是少数php函数接受回调函数作为参数。
As we saw in the examples for lambda functions, one of the most obvious USES for closures is in the few PHP functions that accept a callback function as a parameter.
即使你觉得阅读法语不难，你也会发现用法语对话完全是另一回事。
Even if you read French easily, you'll find it's another cup of tea to make.
即使你觉得阅读法语并不难，你仍然会发现用法语对话完全是另一回事。
Even if you read French easily, you'll find it's another cup of tea to make conversation in French.
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