使用场景
有时候我们需要修改数组的键名,比如获取excel表格的数据时候，获取到的表格数据的键名是：ABC
一维数组修改键名
$arr=array(1 => 1, 2 => "张三", 3 => 20);
$key=array("id","姓名","年龄");
$array=array_combine($key, $arr);
二维数组修改键名
$arr = [
["A" => 1, "B" => "张三", "C" => 20],
["A" => 2, "B" => "李四", "C" => 20]
];
$key = array("id","姓名","年龄");
foreach($arr as $key => $item){
$arr[$key] = array_combine($key, $item);
}