PHP incorrectly closes file handles when used to replace STDIN/STDOUT/STDERR

Description

The following code:

<?php
  fclose(STDIN);
  fclose(STDOUT);
  fclose(STDERR);
  fopen('/dev/null', 'r');
  fopen('/dev/null', 'w');
  fopen('/dev/null', 'w');

  exec("dig +noall +answer -t ns -q 'www.google.com'", $out, $ret);
  file_put_contents('ret.txt', $ret . "\n");

Resulted in exec failing with the return code 134 as seen in ret.txt

PHP's garbage collection seems to have not taken into account that the file handles opened are now in use as stdin/stdout/stderr. Obviously this can be worked around by storing the result of fopen into some global vars, but IMO this is a bug.

PHP Version

PHP 8.2.6

Operating System

Debian 11

首先在 Debian 11 上重现 PHP 8.2.6 示例，重点关注 STDIN、STDOUT 和 STDERR 的替换以及后续的垃圾回收。跟踪 exec 运行前这些标准流的处理方式。当替换句柄未保存在全局变量中时，该命令不再以返回码 134 失败，即表示完成。