PHP sorts array according to the size of a certain key value

This article mainly introduces to you the method of PHP to sort according to the size of a certain key value of the array, involving PHP's operation skills for array traversal, sorting and other related operations. Friends who need it can refer to it. I hope it can help you.

Problem:Sort the key value of a key in a given array

Solution:

//$a是排序数组，$b是要排序的数据集合，$result是最终结果
$b = array(
  array('name'=>'北京','nums'=>'200'),
  array('name'=>'上海','nums'=>'80'),
  array('name'=>'广州','nums'=>'150'),
  array('name'=>'深圳','nums'=>'70')
  );
$a = array();
foreach($b as $key=>$val){
  $a[] = $val['nums'];//这里要注意$val['nums']不能为空，不然后面会出问题
}
//$a先排序
rsort($a);
$a = array_flip($a);
$result = array();
foreach($b as $k=>$v){
  $temp1 = $v['nums'];
  $temp2 = $a[$temp1];
  $result[$temp2] = $v;
}
//这里还要把$result进行排序，健的位置不对
ksort($result);
//然后就是你想看到的结果了
var_dump($result);

Running result:

array(4) {
 [0]=>
 array(2) {
  ["name"]=>
  string(4) "北京"
  ["nums"]=>
  string(3) "200"
 }
 [1]=>
 array(2) {
  ["name"]=>
  string(4) "广州"
  ["nums"]=>
  string(3) "150"
 }
 [2]=>
 array(2) {
  ["name"]=>
  string(4) "上海"
  ["nums"]=>
  string(2) "80"
 }
 [3]=>
 array(2) {
  ["name"]=>
  string(4) "深圳"
  ["nums"]=>
  string(2) "70"
 }
}

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