这篇文章主要介绍了php中的while循环，有一定的参考价值，感兴趣的朋友可以参考一下，希望对你有所帮助!
1 while(condition)2 {3 func();4 //break the loop5 6 }
while循环的执行顺序是先判断condition是不是true，如果是true，那么就执行while循环体的代码，这是一个回合，
然后再次判断condition是否为true。。。。进入下个回合。那么什么时候退出循环呢？通常在while循环体里面有自增或者自减代码，它们的就是为了跳出循环而存在的，当然还有一些其它的语句强制跳出循环，比如break。
需要注意的点：while循环每次执行都会判断condition是否为true。
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