<?php
echo strtr('Important: you are NOT allowed to use a built-in function that converts the string (or just one character) to lowercase (such as ToLower() in .NET, strtolower() in PHP , ...)! You\'re allowed to use all other built-in functions, however.', range('A', 'Z'), range('a', 'z'));
Fatal error: Uncaught TypeError: strtr(): Argument #3 ($to) must be of type ?string, array given in /in/aCEfK:2
Stack trace:
#0 /in/aCEfK(2): strtr('Important: you ...', Array, Array)
#1 {main}
thrown in /in/aCEfK on line 2
Process exited with code 255.
Important: you are NOT allowed to use a built-in function that converts the string (or just one character) to lowercase (such as ToLower() in .NET, strtolower() in PHP , ...)! You're allowed to use all other built-in functions, however.