返回数据格式问题，返回的不是json格式

查询返回的数据格式为什么不是json格式，如何转换成json格式，返回格式如下我想要json格式。
Array ( [0] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5de983adfef7fd0e060b1 [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:08:24.181000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:08:24.181000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [1] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5ded13adfef7fd0e060d8 [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:09:21.591000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:09:21.591000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [2] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e082ceb05208ef8a659f [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:16:34.704000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:16:34.704000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [3] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e0caceb05208ef8a65bb [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:17:46.554000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:17:46.554000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [4] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e1173adfef7fd0e06232 [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:19:03.654000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:19:03.654000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [5] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e1ab3adfef7fd0e062c4 [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:21:31.573000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:21:31.573000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [6] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e20c766aa1328757c4b3 [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:23:08.376000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:23:08.376000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [7] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e22bceb05208ef8a66ee [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:23:39.854000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:23:39.854000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [8] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e7cdceb05208ef8a69db [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:47:41.114000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:47:41.114000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [9] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e887ceb05208ef8a6a48 [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:50:47.852000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:50:47.852000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [10] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e8c13adfef7fd0e06674 [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:51:45.256000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:51:45.256000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) [11] => LeanCloud\LeanObject Object ( [className:LeanCloud\LeanObject:private] => TestObject [data:LeanCloud\LeanObject:private] => Array ( [objectId] => 61d5e8e83adfef7fd0e0668d [words] => Hello world! [createdAt] => DateTime Object ( [date] => 2022-01-06 02:52:24.577000 [timezone_type] => 3 [timezone] => PRC ) [updatedAt] => DateTime Object ( [date] => 2022-01-06 02:52:24.577000 [timezone_type] => 3 [timezone] => PRC ) ) [operationSet:LeanCloud\LeanObject:private] => Array ( ) [saveOption:LeanCloud\LeanObject:private] => ) )