echo（'exit'）;和有什么区别？死;死（'退出'）;? [英] What is the difference between echo('exit'); die; and die('exit');?

问题描述

我已经看到一些代码可以这样做：

I have seen some code do this:

if(something){
    echo 'exit from program';
    die;
}
...more code

其他仅使用 die ：

if(something)   die('exit from program');
...more code

结束程序的时间是否有内在差异，我应该知道它后面的代码吗？等等

Is there any inherent difference in when it would end the program, should I be aware of the code that comes after it? etcetera

更新

我主要是问这是否是一种编码样式，或者是否有真正的原因为什么某些编码方式是另一种编码方式。我不是问 exit 和 die 之间有什么区别。

I am asking mainly, if it is a coding style, or if there is a real reason why some is coded one way versus another. I am not asking what the difference between exit and die is.

推荐答案

不，没有区别；他们都将 exit 写入STDOUT并终止程序。

No, there is no difference; they will both write "exit" to STDOUT and terminate the program.

我更喜欢 die（ exit）方法，因为它的键入较少，更易于注释和语义

I would prefer the die("exit") method as it's less typing, easier to comment out and semantically clearer.

就速度而言，为什么还要关心哪个更快？您是否需要程序迅速消失？

As far as "speed", why would you care which is faster? Do you need your program to die really quickly?

RE：您的更新

...何时结束程序的任何固有差异...

... any inherent difference in when it would end the program ...

有<没有差异，无论是固有差异还是其他差异。它们是相同的。第二个选项 die（'exit'）是单个语句，因此与 if 声明；这与 die 无关，与C风格语言中的块和流控制无关。

There is no difference, inherent or otherwise. They're identical. The second option, die('exit'), is a single statement, and so requires no braces when used with an if statement; this has nothing to do with the die and everything to do with blocks and flow control in C-style languages.

RE：您的评论/第二次更新

您死亡的哪种方式很重要个人喜好。正如我所说的，它们是相同的。我会出于上述原因选择第二个选项：更短，更清晰，更干净，在我看来这相当于更好。

Which way you die is a matter of personal preference. As I said, they are identical. I would choose the 2nd option for the reasons listed above: Shorter, clearer, cleaner, which amounts to "better" in my opinion.

<$ c $之间的差额c> exit 和 die 是 exit 允许您返回非零状态，而 die 返回0。这两个函数都不是更好的，它们有不同的用途。

The difference between exit and die is that exit allows you to return a non-zero status, while die returns 0. Neither function is "better", they serve different purposes.

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