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<?php $a = array('one', 'two'); $b = array('two'); $c = array_diff($one, $two); $c[] = 'three'; var_dump($c);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $one in /in/fj1tC on line 5 Warning: Undefined variable $two in /in/fj1tC on line 5 Fatal error: Uncaught TypeError: array_diff(): Argument #1 ($array) must be of type array, null given in /in/fj1tC:5 Stack trace: #0 /in/fj1tC(5): array_diff(NULL, NULL) #1 {main} thrown in /in/fj1tC on line 5
Process exited with code 255.

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