php数组格式的转换把键名和键值分离出来重组

Array ( [71760] => 2022款 [71763] => 2021款 [71765] => 2020款 )

Array ( [0] => Array ( [b_id] => 71760 [b_name] => 2022款 ) [1] => Array ( [b_id] => 71763 [b_name] => 2021款 ) [2] => Array ( [b_id] => 71765 [b_name] => 2020款 ) )

怎么把上面的数组转化成下面的数组呢，哪位大哥指教下直接给个代码，本人是菜鸟谢谢了

题主要的代码如下

<meta charset="utf-8">
<?php
$arr=Array ( 71760 => '2022款' ,71763 => '2021款',71765 => '2020款' );
$narr=array();
foreach($arr as $k=>$v){
  $narr[]=array('b_id'=>$k,'b_name'=>$v);
}
print_r($narr);

?>

有帮助麻烦点下【采纳该答案】，谢谢~~