In key-value pairs, how to get the sorting of keys based on value size?

For example:

 $test={"A":1,"B":3,"C":2,"D":1,"E":1};

Get:

$result={"B":3,"C":2,"A":1,"D":1,"E":1};

试过rsort($test),不行。
很像sql语句中的orderby,能否有办法？

Reply content:

For example:

 $test={"A":1,"B":3,"C":2,"D":1,"E":1};

Get:

$result={"B":3,"C":2,"A":1,"D":1,"E":1};

试过rsort($test),不行。
很像sql语句中的orderby,能否有办法？

Look at the document

>>> arsort($test)
>>> $test
=> [
     "B" => 3,
     "c" => 2,
     "e" => 1,
     "d" => 1,
     "A" => 1,
   ]

function cmp($a, $b)
{
if ($a == $b) {
    return 0;
}
return ($a < $b) ? -1 : 1;
}
$a = array(3, 2, 5, 6, 1);
usort($a, "cmp");
foreach ($a as $key => $value) {
echo "$key: $value\n";
}

You can take a look at this function array_multisort