Questions about the operation of the PHP array

$temp = Array (' K1 ' =>array (' m1 ' = ' 1 ', ' m2 ' = ' 2 '), ' K2 ' =>array (' m1 ' = ' 3 ', ' m2 ' = ' 4 '));
Like the above structure array, it is reasonable to do something about it.
1. Remove the key value in the $temp array as the ' M1 ' element
2. Sort the $temp array with the key value ' M1 ', ' m2 ' in the specified order
Now all I can think of is using foreach to facilitate the operation of the array, if the array is relatively large, the sense of efficiency is not high, but also a better way?

Reply to discussion (solution)

Traversal is always needed, otherwise you don't know who to operate and who should not.
But who traversed, there was a fastidious

$temp = Array (' K1 ' =>array (' m1 ' = ' 1 ', ' m2 ' = ' 2 '), ' K2 ' =>array (' m1 ' = ' 3 ', ' m2 ' = ' 4 ')); Array_walk ($ Temp, function (& $v) {unset ($v [' m2 ']);}); Print_r ($temp);

Array ([    k1] = = Array        (            [M1] = 1        )    [K2] = = Array        (            [M1] + 3        ))

$temp = Array (' K1 ' =>array (' m1 ' = ' 1 ', ' m2 ' = ' 2 '), ' K2 ' =>array (' m1 ' = ' 3 ', ' m2 ' = ' 4 ')); $newArray = Array ();p Rint_r (Array_map ("Mysort", $newArray, $temp)), function Mysort ($v 1, $v 2) {    $v 1[' m2 '] = $v 2[' M1 '];    $v 1[' m1 ') = $v 2[' m2 '];    return $v 1;}

With regard to the sort, I draw on your ideas to write. Do you have a better way to do it?

What sort of, so?

Array_walk ($temp, function (& $v) {krsort ($v);}); Print_r ($temp);/*array (    [K1] = array        (            [m2] = 2            [M1] + 1        )    [K2] = = Array        ( C7/>[M2] = 4            [M1] + 3        )) */

$temp = Array (' K1 ' =>array (' m1 ' = ' 1 ', ' m2 ' = ' 2 '), ' K2 ' =>array (' m1 ' = ' 3 ', ' m2 ' = ' 4 ')); Array_walk ($ Temp, function (& $v) {krsort ($v);}); Print_r ($temp);

Array ([    k1] = = Array        (            [m2] = 2            [M1] = 1        )    [K2]        = = Array (            [m2] = > 4            [m1] = 3        ))

I mean the original key value order is ' M1 ', ' m2 ', want to get the order is ' m2 ', ' M1 '. Just change the order of the array key according to the custom rule, regardless of the value of the specific element.
Original array
Array
(
[0] = = Array
(
[M2] = 1
[M1] = 2
)

[1] = = Array
(
[M2] = 3
[M1] = 4
)

)
New array
Array
(
[0] = = Array
(
[M2] = 1
[M1] = 2
)

[1] = = Array
(
[M2] = 3
[M1] = 4
)

)

$temp = Array (' K1 ' =>array (' m1 ' = ' 1 ', ' m2 ' = ' 2 '), ' K2 ' =>array (' m1 ' = ' 3 ', ' m2 ' = ' 4 ')); $k = Array (' m2 ' , ' M1 '); Array_walk ($temp, function (& $v) use ($k) {$v = Array_combine ($k, $v);}); Print_r ($temp);

