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<?php echo preg_replace_callback('~[A-Z]~', function($_) { return $_[0] + 32; }, '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.');
Output for git.master_jit, git.master, rfc.property-hooks
Fatal error: Uncaught TypeError: Unsupported operand types: string + int in /in/P23AV:2 Stack trace: #0 [internal function]: {closure}(Array) #1 /in/P23AV(2): preg_replace_callback('~[A-Z]~', Object(Closure), 'Important: you ...') #2 {main} thrown in /in/P23AV on line 2
Process exited with code 255.

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