php - 如何将元素添加到 php 数组而不显示为新数组

Question

下面代码的目的是从一个 mysql 表中提取消息，并将它们中的每一个放在一个数组中，每个输出周围都有 {}。如您所见，每个输出都包含各种参数，并且本身就是一个数组。 代码的作用是每次处理循环时，在稍后转换成的 JSON 数组中，它将输出包装在 [] 中，因此现在创建了一个新数组。 我得到的是:

[{"sender":"ll","message":"blah","timestamp":"2016-12-21 14:43:04","username":"","msgtype":"","threadid":"32629016712222016034323"},{"sender":"kk","message":"blahblah","timestamp":"2016-12-21 14:43:23","username":"","msgtype":"","threadid":"32629016712222016034323"},{"sender":"ll","message":"blahblahblah","timestamp":"2016-12-21 14:43:47","username":"","msgtype":"","threadid":"32629016712222016034323"}],[{"sender":"ll","message":"blahblahblahblah","timestamp":"2016-12-21 14:43:04","username":"","msgtype":"","threadid":"92337321312222016034304"},{"sender":"kk","message":"blahblahblahblahblah","timestamp":"2016-12-21 14:44:05","username":"","msgtype":"","threadid":"92337321312222016034304"}]]

我想要的是:

[{"sender":"ll","message":"blah","timestamp":"2016-12-21 14:43:04","username":"","msgtype":"","threadid":"32629016712222016034323"},{"sender":"kk","message":"blahblah","timestamp":"2016-12-21 14:43:23","username":"","msgtype":"","threadid":"32629016712222016034323"},{"sender":"ll","message":"blahblahblah","timestamp":"2016-12-21 14:43:47","username":"","msgtype":"","threadid":"32629016712222016034323"}],{"sender":"ll","message":"blahblahblahblah","timestamp":"2016-12-21 14:43:04","username":"","msgtype":"","threadid":"92337321312222016034304"},{"sender":"kk","message":"blahblahblahblahblah","timestamp":"2016-12-21 14:44:05","username":"","msgtype":"","threadid":"92337321312222016034304"}]

我如何继续在这里获得正确的结果？

$data = array ();
foreach($threads as $threadid){
$sql = ("SELECT sender,message,timestamp,username,msgtype,threadid FROM    Messages WHERE  threadid = '$threadid' AND subject = '' AND timestamp >    '$newtimestamp' ORDER BY timestamp");
$arrayOfObjects = $conn->query($sql)->fetchAll(PDO::FETCH_OBJ);
$data[] = $$arrayOfObjects;
}

仅供引用，$threadid 是另一个包含...threadid 的数组，并且循环正确地一个接一个地获取它们，这不是问题所在。

提前致谢!

Answer 1

您正在执行 O(N) 数据库查询，请考虑在您的 where 子句中使用 IN 表达式仅执行 O(1)。无需 foreach 循环，您将在一个数组中获取所有数据。

SELECT ... FROM Messages WHERE threadid IN (1, 2, 3, ...) AND ...

您可能必须为此使用准备好的语句。