没有区别，它们是一样的。

PHP退出手册:

注意:这个语言结构相当于die()。

PHP模具手册:

这个语言结构相当于exit()。

Die()比exit()输入更快;

这个页面说die是一个退出，所以它们是相同的。但也解释了:

有些函数因为API清理或其他原因更改了名称，旧的名称仅作为向后兼容的别名保留。使用这类别名通常不是一个好主意，因为它们可能会过时或重命名，这将导致不可移植的脚本。

所以，你可以说我是偏执狂，但未来可能不会有死亡。

这里有一些非常有趣的东西。虽然exit()和die()是等价的，但die()关闭了连接。Exit()不会关闭连接。

die ():

<?php
    header('HTTP/1.1 304 Not Modified');
    die();
?>

退出():

<?php
    header('HTTP/1.1 304 Not Modified');
    exit();
?>

结果:

die ():

HTTP/1.1 304 Not Modified 
Connection: close

退出():

HTTP/1.1 304 Not Modified 
Connection: Keep-Alive 
Keep-Alive: timeout=5, max=100

只是以防万一，需要把这考虑到你的项目。

学分:https://stackoverflow.com/a/20932511/4357238

https://3v4l.org的输出说明die和exit在功能上是相同的。

起源差异

在PHP中die()和exit()的区别在于它们的起源。

exit()是来自C中的exit()。 die()来自Perl中的die。

的功能与

Die()和exit()是等价的函数。

PHP手册

PHP模具手册:

这个语言结构相当于exit()。

PHP退出手册:

注意:这个语言结构相当于die()。

PHP函数别名列表手册:

Die是主函数exit()的别名

不同于其他语言

die()和exit()在其他语言中是不同的，但在PHP中它们是相同的。

来自另一个PHP的咆哮:

...As a C and Perl coder, I was ready to answer, "Why, exit() just bails off the program with a numeric exit status, while die() prints out the error message to stderr and exits with EXIT_FAILURE status." But then I remembered we're in messy-syntax-land of PHP. In PHP, exit() and die() are identical. The designers obviously thought "Hmm, let's borrow exit() from C. And Perl folks probably will like it if we take die() as is from Perl too. Oops! We have two exit functions now! Let's make it so that they both can take a string or integer as an argument and make them identical!" The end result is that this didn't really make things any "easier", just more confusing. C and Perl coders will continue to use exit() to toss an integer exit value only, and die() to toss an error message and exit with a failure. Newbies and PHP-as-a-first-language people will probably wonder "umm, two exit functions, which one should I use?" The manual doesn't explain why there's exit() and die(). In general, PHP has a lot of weird redundancy like this - it tries to be friendly to people who come from different language backgrounds, but while doing so, it creates confusing redundancy.