PHP 二维数组根据某个字段排序复制代码 array_multisort

约定不等于承诺〃 2022-05-31 01:58 189阅读 0赞

//二维数组，按照里面的age从大到小降序，代码如下

<?php
    header('Content-Type:text/html;Charset=utf-8');
    $arrUsers = array(
        array('id'   => 1,'name' => '张三','age'  => 25,),
        array('id'   => 2,'name' => '李四','age'  => 23,),
        array('id'   => 3,'name' => '王五','age'  => 40,),
        array('id'   => 4,'name' => '赵六','age'  => 31,),
        array('id'   => 5,'name' => '黄七','age'  => 20,),
    );
    
    $arrSort = array();
    foreach($arrUsers as $uniqid => $row){
        foreach($row as $key=>$value){
            $arrSort[$key][$uniqid] = $value;
        }
    }
    //$arrSort 为
    // array(
    //   "id"=>array(1,2,3,4,5),
    //   "name"=>array("张三","李四","王五","赵六","黄七"),
    //   "age"=>array(25,23,40,31,20)
    // );
    
    //array_multisort(排序字段，倒序/顺序，数组)
    array_multisort($arrSort['age'], constant('SORT_DESC'), $arrUsers);
    
    echo '<pre>';
    var_dump($arrUsers);
    
    /*
    输出结果：
    
    array(5) {
      [0]=>
      array(3) {
        ["id"]=>
        int(3)
        ["name"]=>
        string(6) "王五"
        ["age"]=>
        int(40)
      }
      [1]=>
      array(3) {
        ["id"]=>
        int(4)
        ["name"]=>
        string(6) "赵六"
        ["age"]=>
        int(31)
      }
      [2]=>
      array(3) {
        ["id"]=>
        int(1)
        ["name"]=>
        string(6) "张三"
        ["age"]=>
        int(25)
      }
      [3]=>
      array(3) {
        ["id"]=>
        int(2)
        ["name"]=>
        string(6) "李四"
        ["age"]=>
        int(23)
      }
      [4]=>
      array(3) {
        ["id"]=>
        int(5)
        ["name"]=>
        string(6) "黄七"
        ["age"]=>
        int(20)
      }
    }
    
    */