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<?php class test { public function run() { array_walk($list = ['fuck', 'white'], [$this, 'sqlFilter']); var_dump($list); } private function sqlFilter($key, &$value) { $value = ucfirst($value); } } (new test)->run();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: array_walk(): Argument #1 ($array) cannot be passed by reference in /in/t6v7Y:5 Stack trace: #0 /in/t6v7Y(12): test->run() #1 {main} thrown in /in/t6v7Y on line 5
Process exited with code 255.

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