What should I do if the usort () function in PHP is non-stable sorting?

What should I do if the usort () function in PHP is non-stable sorting? Project requirements
A group of data is first sorted by parameter 1, and then by parameter 2 if parameter 1 is the same.
If usort is a stable sort, use usort to sort the array by parameter 2, and then sort the sorted array by parameter 1.
However, after the test, the usort sorting is unstable. what should I do?
The code is as follows:

 1,'key2'=>1);$a2 = array('key1'=>2,'key2'=>2);$a3 = array('key1'=>2,'key2'=>3);$a = array($a3,$a2,$a1);usort($a,"my_sort2");print_r($a);usort($a,"my_sort1");print_r($a);function my_sort1($a,$b){if ($a['key1']==$b['key1']) return 0;return ($a['key1']<$b['key1'])?-1:1;}function my_sort2($a,$b){if ($a['key2']==$b['key2']) return 0;return ($a['key2']<$b['key2'])?-1:1;}?>

The output is as follows:

Array(    [0] => Array        (            [key1] => 1            [key2] => 1        )    [1] => Array        (            [key1] => 2            [key2] => 2        )    [2] => Array        (            [key1] => 2            [key2] => 3        ))Array(    [0] => Array        (            [key1] => 1            [key2] => 1        )    [1] => Array        (            [key1] => 2            [key2] => 3        )    [2] => Array        (            [key1] => 2            [key2] => 2        ))

In this case, can I write a stable sorting algorithm like insert sorting?

Reply to discussion (solution)

$a1 = array('key1'=>1,'key2'=>1);$a2 = array('key1'=>2,'key2'=>2);$a3 = array('key1'=>2,'key2'=>3);$a = array($a3,$a2,$a1);foreach($a as $v) {  $r2[] = $v['key2'];  $r1[] = $v['key1'];}array_multisort($r1,$r1, $a);print_r($a);

Array(    [0] => Array        (            [key1] => 1            [key2] => 1        )    [1] => Array        (            [key1] => 2            [key2] => 2        )    [2] => Array        (            [key1] => 2            [key2] => 3        ))

Use array_multisort to sort multi-dimensional arrays.
Http://php.net/manual/zh/function.array-multisort.php

 1,'key2'=>1);$a2 = array('key1'=>2,'key2'=>2);$a3 = array('key1'=>2,'key2'=>3);$a = array($a3,$a2,$a1);foreach($a as $v){     $ar1[] = $v['key1'];     $ar2[] = $v['key2'];}array_multisort($ar1,SORT_ASC,$ar2,SORT_ASC, $a);print_r($a);?>

Array
(
[0] => Array
(
[Key1] => 1
[Key2] => 1
)

[1] => Array
(
[Key1] => 2
[Key2] => 2
)

[2] => Array
(
[Key1] => 2
[Key2] => 3
)

)

Thank you for your guidance. @ xuzuning @ Aoxue Xingfeng