PHP - 返回后中断？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/7280716/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
PHP - Break after return?
提问by headacheCoder
do I need to use break here or will it stop looping and just return once?
我需要在这里使用 break 还是它会停止循环并返回一次？
for($i = 0; $i < 5; $i ++) {
if($var[$i] === '') return false;
// break;
}
Thank you!
谢谢！
采纳答案by Pekka
It will run just once, stop looping, and exit from the function/method.
它将只运行一次，停止循环，并退出函数/方法。
It could be argued though that this is bad style. It is very easy to overlook that returnlater, which is bad for debugging and maintenance.
可以说这是不好的风格。return以后很容易忽略这一点，不利于调试和维护。
Using breakmight be cleaner:
使用break可能更干净：
for($i = 0; $i < 5; $i ++) {
if($var[$i] === '')
{ set_some_condition;
break;
}
}
if (some_condition)
return;
回答by Rijk
If you use return, your function (or entire script) will return - all code after that won't be executed. So to answer your question: a breakis not required here. However, if the breakwas not commented out here, the loop would have stopped after one iteration. That's because your if statement doesn't use braces ({ ... }) so it only covers the returnstatement (in other words: the breakin your example is always executed).
如果您使用return，您的函数（或整个脚本）将返回 - 之后的所有代码都不会执行。所以回答你的问题：break这里不需要a 。但是，如果break这里没有注释掉，循环将在一次迭代后停止。那是因为您的 if 语句不使用大括号 ( { ... })，因此它仅涵盖该return语句（换句话说：break您的示例中的the始终被执行）。
回答by Ronnie Oosting
Update:
更新：
PHP 7 requires a return. A break;is not needed because the loop ends on return.
PHP 7 需要一个return. break;不需要A ，因为循环结束于return。
A break;is usually used in a switch or loop whenever you have found your needed item.
break;当您找到需要的项目时，A通常用于开关或循环中。
Example:
例子：
$items = ['a' , 'b' , 'c'];
foreach($items as $item)
{
if($item == 'a')
{
return true; // the foreach will stop once 'a' is found and returns true.
}
return false; // if 'a' is not found, the foreach will return false.
}
