二维数组根据某个字段排序

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    <?php  
    /** 
     * 二维数组根据某个字段排序 
     * 功能：按照用户的年龄倒序排序 
     */  
    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,  
        ),  
    );   
      
      
    $sort = array(  
            "direction" => "SORT_DESC", //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序  
            "field"     => "age",       //排序字段  
    );  
    $arrSort = array();  
    foreach($arrUsers AS $uniqid => $row){  
        foreach($row AS $key=>$value){  
            $arrSort[$key][$uniqid] = $value;  
        }  
    }  
    if($sort["direction"]){  
        array_multisort($arrSort[$sort["field"]], constant($sort["direction"]), $arrUsers);  
    }  
      
    var_dump($arrUsers);  
      
    /* 
    输出结果： 
     
    array (size=5) 
      0 =>  
        array (size=3) 
          "id" => int 5 
          "name" => string "黄七" (length=6) 
          "age" => int 20 
      1 =>  
        array (size=3) 
          "id" => int 2 
          "name" => string "李四" (length=6) 
          "age" => int 23 
      2 =>  
        array (size=3) 
          "id" => int 1 
          "name" => string "张三" (length=6) 
          "age" => int 25 
      3 =>  
        array (size=3) 
          "id" => int 4 
          "name" => string "赵六" (length=6) 
          "age" => int 31 
      4 =>  
        array (size=3) 
          "id" => int 3 
          "name" => string "王五" (length=6) 
          "age" => int 40 
     
    */