Die And Exit As Functions
Die and Exit used to be language constructs, a special kind of PHP instructions. As such, they had special abilities and behaviors: in particular, it meant that they could not be called dynamically, with their name in a string. Since PHP 8.4, this is possible.
PHP code
<?php
//Uncaught Error: Call to undefined function \exit()
$s = 'exit';
$s('Exit');
?>
Before
PHP Fatal error: Uncaught Error: Call to undefined function exit()
After
Exit
PHP version change
This behavior changed in 8.4.