Thinkphp两张数据表left join怎么让相同字段不被覆盖

$name = M('User')->join('LEFT JOIN before_conditions on before_conditions.uid=User.id')->where($mapBarCode)->select();
for($i=0;$i<count($name);$i++){
$name_b=M('before_conditions')->where("")->find();
$name[$i]['b_id'] = $name_b['id'];
}
dump($name); 输出结果user表的id几不会被覆盖

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