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<?php $a = ['mo' => true, 'tue' => false]; var_dump(array_filter($a, function($k,$v) { return $v; }, ARRAY_USE_BOTH));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "ARRAY_USE_BOTH" in /in/pEcGM:5 Stack trace: #0 {main} thrown in /in/pEcGM on line 5
Process exited with code 255.

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