請問new stdclass()是什麼作用,一般用在什麼情境?
謝謝。
回複內容:
請問new stdclass()是什麼作用,一般用在什麼情境?
謝謝。
感謝提問,在stackOverFlow找到了答案,下面翻譯過來:
1、在返回特定資料類型的時候,使用stdClass,如:
$person -> name = "John" -> surname = "Miller" -> address = "123 Fake St"
2、在返回同類型資料的列表時使用Array,如:
"John Miller" "Peter Miller" "Josh Swanson" "Harry Miller"
3、在返回特定類型的列表時,stdClass、array並用,如:
$person[0] -> name = "John" -> surname = "Miller" -> address = "123 Fake St" $person[1] -> name = "Peter" -> surname = "Miller" -> address = "345 High St"
個人認為:在不同的用途下使用array或stdClass,或兩者結合,更加便捷。
我常用在儲存資料 主要是開銷比較小
$obj = new stdClass;$obj->test = 'abc';$obj->other = 6.2;$obj->arr = array (1, 2, 3);
比數組更便捷
測試
$size = 200000;mark();$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);}
結果
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
orm中要用,把查詢的每一條紀錄轉換成一個class,每個欄位就成了屬性