<?php $array = [ 0 => [ "groupid" => "5", "radminid" => "1", "type" => "system", "system" => "private", ], 1 => [ "groupid" => "10", "radminid" => "2", "type" => "system", "system" => "private", ], ]; $array = array_column($array, null, 'groupid'); print_r($array);die;
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