set_exception_handler not restored if calling exit within itself

Description

What was fixed https://github.com/php/php-src/commit/3301d9602a2307007858c299c41795d3d95e3843 https://github.com/php/php-src/issues/13446#issuecomment-1991549384 bc it was broken from 8.3.0-8.3.4 is still broken if the exception handler itself calls exit.

https://3v4l.org/HkWfh
without exit: https://3v4l.org/FTWQf

The following code:

<?php

declare(strict_types=1);

function foo($e) {
    var_dump( set_exception_handler('foo') );
    restore_exception_handler();
    echo "---" . PHP_EOL;
    exit;
}

set_exception_handler('foo');

register_shutdown_function(function () {
    var_dump( set_exception_handler(null) );
});

strlen(null);

Resulted in this output:

NULL
---
NULL

But I expected this output instead:

NULL
---
string(3) "foo"

This matters, because since PHP 8.3, the exit code of the exit() call in exception handler is used as exit code of PHP

@iluuu1994

PHP Version

PHP 8.3.0+

Operating System

No response

首先，使用提供的 PHP 脚本复现该行为，并比较链接的 3v4l 示例中的 exit 和非 exit 情况。跟踪 PHP 运行时中 set_exception_handler()、restore_exception_handler()、register_shutdown_function() 和 exit 之间的交互。当在 exception handler 内调用 exit 时，shutdown callback 能观察到已恢复的 "foo" handler，即表示完成。