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<?php $array = [ [ "referrer_id" => "usr157" ], [ "referrer_id" => "usr42" ] ]; $flatten = array_map(function($item) { return array_values($item)[0]; }, $array); var_dump($flatten);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(6) "usr157" [1]=> string(5) "usr42" }

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