在键值对中，如何根据value大小得到key的排序？

Question

如：$test={"A":1,"B":3,"C":2,"D":1,"E":1};得到：$result={"B":3,"C":2,"A":1,"D":1,"E":1};试过rsort($test),不行

三叔 · Answer

可以看下这个函数 array_multisort

三叔 · Answer

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
";

}

三叔 · Answer

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