Undefined function error even if in block guarded with function_exists(...)

[smuuf]

Describe the bug
I think Intelephense should (could...?) not report a Undefined function '...' error when in block that has a function_exists(...) check around it. Honestly I'm unsure whether this is a bug report or a feature request :)

To Reproduce

<?php

if (function_exists('xdebug_break')) {
	\xdebug_break();
}

Expected behavior
I expect Intelephense not to report Undefined function 'xdebug_break'. intelephense(P1010) in the above case. (I also tried namespacing the checked function: function_exists('\\xdebug_break')), but still yields the same result.)

Note: The same result happens regardless of whether xdebug extension is actually loaded in PHP or not (phpenmod/phpdismod xdebug) - but I don't think it should matter, because the function_exists should be enough.

Screenshots

Platform and version

• Windows 11 + WSL2
• PHP Intelephense v1.12.6