Description:
------------
The PHP documentation for ob_get_status says that the returned "type" key may be one of PHP_OUTPUT_HANDLER_INTERNAL or PHP_OUTPUT_HANDLER_USER:
https://www.php.net/manual/en/function.ob-get-status.php

However, these constants have historically not been defined and are still undefined:
https://github.com/php/php-src/blob/29e5e4719c253e28f521f9fbee6b1bf2ea5f7e22/main/output.c#L206

Since PHP 8, undefined constants are now fatal errors. This means the following code, which the documentation suggests should work, will now throw a fatal error.

So this is either a PHP bug (two missing output-control constants), or a PHP documentation bug (docs mentioning constants that do not exist).

Test script:
---------------
ob_start();

$status = ob_get_status();

if ($status['type'] == PHP_OUTPUT_HANDLER_INTERNAL) // fatal error
// do something

Expected result:
----------------
The condition should be evaluated without notice, warning, or fatal error; or the documentation should be updated so that it no longer suggests that these constants exist and are return values of ob_get_status.

Actual result:
--------------
Before 7.2: E_NOTICE
7.2-7.4: E_WARNING
8+: fatal