将2个数组字段保存为新数组？

My problem may seem very simple, and I'm probably missing something. I need to save 2 fields from an array called $data1 as a different array.

[cat_id] => 1
[parent_id] => 0
[cat_left] => 1
[options] => 0
[name] => soccer
[creator] => 0

and I need to save cat_id => name, like :

1 => soccer

I tried with foreach but all I managed to do is mess up more.

foreach($data1 as $k=>$v)
        {
            $cat_arr[]= $v['cat_id'] => $v['name'];
        }

Any help would be appreciated.

I assume, that $data1 holds multiple sub-arrays of the form you posted. Then you can just use code like this:

$cat_arr = array();
foreach($data1 as $k=>$v) {
  $cat_arr[ $v['cat_id'] ]= $v['name'];
}

You can use array_map(), which is more elegant:

$data2 = array_map(
    function ($n) {
        return array($n['cat_id'] => $n['name']);
    },
    $data1
);

Fiddle