PHP实现根据数组某个键值大小进行排序的方法

正规网赌平台,本文实例讲述了php自定义二维数组排序函数array_orderby用法。分享给大家供大家参考,具体如下:

本文实例讲述了PHP实现根据数组某个键值大小进行排序的方法。分享给大家供大家参考,具体如下:

<?php
/**
I came up with an easy way to sort database-style results. This does what example 3 does, except it takes care of creating those intermediate arrays for you before passing control on to array_multisort(). 
*/
function array_orderby()
{
  $args = func_get_args();
  $data = array_shift($args);
  foreach ($args as $n => $field) {
    if (is_string($field)) {
      $tmp = array();
      foreach ($data as $key => $row)
        $tmp[$key] = $row[$field];
      $args[$n] = $tmp;
      }
  }
  $args[] = &$data;
  call_user_func_array('array_multisort', $args);
  return array_pop($args);
}
/*
The sorted array is now in the return value of the function instead of being passed by reference.
*/
$data[] = array('volume' => 67, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 1);
$data[] = array('volume' => 85, 'edition' => 6);
$data[] = array('volume' => 98, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 6);
$data[] = array('volume' => 67, 'edition' => 7);
// Pass the array, followed by the column names and sort flags
$sorted = array_orderby($data, 'volume', SORT_DESC, 'edition', SORT_ASC);
print_r($sorted)
?>

问题:针对给定数组的某个键的键值进行排序

运行结果:

解决方法:

Array
(
  [0] => Array
    (
      [volume] => 98
      [edition] => 2
    )
  [1] => Array
    (
      [volume] => 86
      [edition] => 1
    )
  [2] => Array
    (
      [volume] => 86
      [edition] => 6
    )
  [3] => Array
    (
      [volume] => 85
      [edition] => 6
    )
  [4] => Array
    (
      [volume] => 67
      [edition] => 2
    )
  [5] => Array
    (
      [volume] => 67
      [edition] => 7
    )
)
//$a是排序数组,$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);

PS:这里再为大家推荐一款关于排序的演示工具供大家参考:

运行结果:

在线动画演示插入/选择/冒泡/归并/希尔/快速排序算法过程工具: http://tools.jb51.net/aideddesign/paixu_ys

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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