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<?php $arr = [ 'foo', 'foo', 'bar', 'baz', 'baz' ]; var_dump(array_intersect($arr, $arr));
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> string(3) "foo" [1]=> string(3) "foo" [2]=> string(3) "bar" [3]=> string(3) "baz" [4]=> string(3) "baz" }

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