php中new stdclass()用在什么场景

Question

请问new stdclass()是什么作用，一般用在什么场景？
谢谢。

Answer 1

感谢提问，在stackOverFlow找到了答案，下面翻译过来:
1、在返回特定数据类型的时候，使用stdClass，如：

$person
   -> name = "John"
   -> surname = "Miller"
   -> address = "123 Fake St"

2、在返回同类型数据的列表时使用Array，如：

  "John Miller"
  "Peter Miller"
  "Josh Swanson"
  "Harry Miller"

3、在返回特定类型的列表时，stdClass、array并用，如：

 $person[0]
    -> name = "John"
    -> surname = "Miller"
    -> address = "123 Fake St"


  $person[1]
    -> name = "Peter"
    -> surname = "Miller"
    -> address = "345 High St"

个人认为：在不同的用途下使用array或stdClass,或两者结合，更加便捷。

Answer 2

我常用在保存数据 主要是开销比较小

$obj = new stdClass;
$obj->test = 'abc';
$obj->other = 6.2;
$obj->arr = array (1, 2, 3);

比数组更便捷

测试

$size = 200000;

mark();
$sc = new  stdClass;
foreach(range(1,5) as $i){
    $sc->$i = pow($i,2);
}
mark();
dump('sc',1);


mark();
foreach(range(1,$size) as $i){
    $scn = "sc" . $i;

    // $$scn = $sc;
    $arr_sc[] = $sc;
}
mark();
dump('sc');


mark();
$arr =[];
foreach(range(1,5    ) as $i){
    $arr[] = pow($i,2);
}
mark();
dump('arr',1);


mark();
foreach(range(1,$size) as $i){
    $arrn = "arr" . $i;

    // $$arrn = $arr;
    $arr_arr[] = $arr;
}
mark();
dump('arr');


function dump($var,$size = 200000){
    global $mem_size,$times,$$var;
    // xdebug_debug_zval($var);
    echo "Total:" .round(($mem_size[count($mem_size)-1]-$mem_size[count($mem_size)-2])/pow(1024,2),3) . "Mb "
        . "Avg:". round(($mem_size[count($mem_size)-1]-$mem_size[count($mem_size)-2])/(1024*$size),3) . "Kb "
        . "Time:". round(($times[count($times)-1] -$times[count($times)-2]),3) ."\n";
}
function mark($type=0){
    global $mem_size,$times;
    $mem_size[] =  memory_get_usage();
    $times[]     =  microtime(true);
}

结果

Total:0.002Mb Avg:1.773Kb Time:0
Total:18.785Mb Avg:0.096Kb Time:0.101
Total:0.001Mb Avg:1.227Kb Time:0
Total:18.785Mb Avg:0.096Kb Time:0.1

Answer 3

orm中要用,把查询的每一条纪录转换成一个class,每个字段就成了属性