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<?php $allBills = [0, 1, 2, null, null]; $bills = array_unique($allBills); if (count($bills) != 1) { $bills = array_filter( $bills, function ($val) { return is_null($val); } ); } print_r($bills);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [3] => )

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