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<?php $a = ['a']; $b= null; var_dump(array_intersect($a, $b));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_intersect(): Argument #2 must be of type array, null given in /in/2Ugg1:7 Stack trace: #0 /in/2Ugg1(7): array_intersect(Array, NULL) #1 {main} thrown in /in/2Ugg1 on line 7
Process exited with code 255.

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