不可能前提为真，结论为假，但是你们不明白，因为他循环，所以有效。
There's no possible situation where the premises are true and the conclusion false but what you don't see that it is only valid because it's circular.
因此，即使用户没有通过cookie检查，$authorized后来在foreach循环中引用时，仍然会被验证为真。
Therefore, even if the user fails the cookie check, $authorized, when referenced later in the foreach loop, will still evaluate to true.
否则测试结果就会一直为真，我们需要离开这个测试，否则就会一直执行循环。
Otherwise the test is always going to be true, we're going to go off here, but this would loop forever if I did that.
另一种常见的算法结构是当条件为“真”时，循环执行一条语句或者语句序列。
Another common algorithmic structure involves that the need to continue executing a statement or sequence of statements as long as some condition remains true.
不要简单地使用，而(真)循环。
要真现那个新的目标，又能够接纳新的四步循环。
循环控制结构可以定义为：当一个条件为真时，重复地完成一组指令。
The repetition control structure can be defined as the presentation of a set ofinstructions tobe performedrepeatedly, as longas acondition is true .
如果正常退出了循环意味着我们没找到e就返回真。
If we exit the loop normally, that means we didn't find an "e", so we return True.
如果条件为真，执行循环体，然后再调回到第一步。
If the condition is true, run the body and then go back to step 1.
如果条件为真，执行循环体，然后再调回到第一步。
If the condition is true, run the body and then go back to step 1.
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