# 1.11 循环结构
循环，这个太常用了。我们为什么使用计算机，而不是手动一个一个处理，就是因为计算机善于处理循环的结构。把最枯燥的部分，扔给机器，它喜欢这样。
循环的应用场景，很多。比如对于数组的处理，我们在程序当中，总是有很多规格的数据要处理，转化，转换，格式化。而数组，也即是我们本书所要讲的重点知识，在PHP中非常常见。
PHP中的循环结构，有3中语法结构。
- for循环
- foreach 循环
- while循环
1 – for循环
话不多说，直接上代码。看下面这段：
for语句内位置参数，第一个是循环因子的初始值，第二个是跳出循环的判断条件，第三个是运行式。
上述代码中，在条件判断else中使用continue语句，表示，这一轮算了，就这样了，不要管了，直接开始下一轮循环吧。默认跳出一层循环。如果循环层数多了，可以指定跳出几层。
下面我们举一个直观的例子，大家在视觉上对for循环有个认识。我们输出10个进度条，分别从10%-100%，递加10%。
为了说明效果，HTML和PHP混合写了，大家知道这个运行机制就可以了，这不是最佳实践。
注意样式是使用的 bs 。
老规矩，在浏览器内访问 www.array.com/chapter1.5.php ,刷新后效果如下图：
怎么样，效果是不是很直观。一共10个循环，每次递增10，展示出来就是这样了。
2 – foreach循环
foreach 语法结构提供了遍历数组的简单方式。
foreach 仅能够应用于数组和对象 ，如果尝试应用于其他数据类型的变量，或者未初始化的变量将发出错误信息。
你如果曾留意一些框架，或者代码库，对此君一定不会陌生。没错儿，到处都是它。
先列举几个简单的列子，大家看一看，应该就能明白语法结构了。
$temp是一个数组。再看复杂一些的：
这次循环的时候使用 $k=>$v结构，$k保留索引值，$v保留数值。
PHP内的foreach循环大抵如此。我们使用时，大可不必考虑数组长度，只用考虑数组是一个什么结构，是关联数组，还是一维简单数组，对应处理即可。
3 – while循环
while循环用的也应该算是最低的，为什么？一不留神，死循环！会一直到PHP的timeout时间30秒。这是不允许出现的。
还是通过代码认识一下其结构。
上面这段代码，是对文件的操作 句柄 $ fp ，判断其是否到了文件结尾feof()函数。
如果不是文件末尾，继续循环。执行结构体内的语句。
当然，上面代码中使用if判断语句，如果执行到一行，没有任何字符，仅仅是换行符，这个说明是空行，那也直接执行 break 。这也能 跳出循环 。
有时候为了写一个命令行运行的文件，要守护进程，永远不过期，永远不退出，那可能就需要一个死循环，用云运行下去。下面的代码看一下：
大家看，这就是一个while(true)典型的死循环。为什么这么用？因为我们不知道到底要处理多少数据，不知道到底有多少循环。因此只能这样，硬着头皮走下去，那么在遇到合适的跳出条件时，使用break跳出循环。
在订单处理中，预先不能预估数据量的话，不用这样的办法，可用的选择似乎并不多。
为了加深印象，我们再看一个完整的函数：
上述函数解析url内的query string部分，类似 a=1&b=3&c=9这样，一个一个地截断操作。知道将 字符串 字段到最后没有任何值，那么 strlen ($nvpstr) === 0，这时候while循环退出，函数返回。
大家完全可以发挥想象力，使用这简单的结构，构造出复杂的应用。
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