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<?php $yourArr = [1,2,1,2,3,4,5]; $res = array_count_values($yourArr); $res = array_filter($res, function($item){ return $item == 1; }); print_r(array_keys($res));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 3 [1] => 4 [2] => 5 )

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