/*$arr = [
['name' => 1,'age' =>2],
['name' => 2,'age' =>3],
['name' => 3,'age' =>4],
['name' => 4,'age' =>5],
];
echo substr(array_reduce($arr,function($result,$val){
return $result.$val['name'].',';
}),0,-1);
$name_str = array_reduce($arr,function($result,$val){
return $result.'-'.$val['name'];
},'434');
var_dump($name_str);
// 计算二维数组里面的name值得集合
$value = array_reduce($arr,function($result,$val){
return $result+=$val['name'];
});
var_dump($value);*/
$arr = ['fsd'=>'fds','fsdf'=>'dfsdfs'];
$new_arr = array_map(function($val){
return strtoupper($val);
},$arr);
var_dump($new_arr);die;