$pcidarr = [];在开始前一定要设置这个
foreach($mid_arr as $k => $mid){ $rs3 = Db::name('register_module_pro_city')->field('province')->select(); if(count($rs3)>0){ $pcidarr= array_merge($pcidarr,array_values(array_unique(array_column($rs3,'province')))); }}
$pcidarr = array_values(array_unique($pcidarr));
