如何通过设置变量执行PHP mysqli多查询

Question

I want to execute a multi query in PHP MySQL , and get the result. My queries are like this.

$sql1 = "set @uid:=(select chat_id from chat_notify where online=1 and engaged=0 limit 1);";
$sql1 .= "update chat_notify set engaged=1,emp_id=1 where chat_id=@uid;";
$sql1 .= " select @uid";

$sql = $mysqli->multi_query($sql1);

I want to get the result of the uid in php .

Answer 1

Change your code accordingly

$sql1 = "set @uid:=(select chat_id from chat_notify where online=1 and engaged=0 limit 1)";
$sql2 = "update chat_notify set engaged=1,emp_id=1 where chat_id=@uid";
$sql3 = "select @uid";

$mysqli->query($sql1);
$mysqli->query($sql2);
$res = $mysqli->query($sql3);

and then get your query result usual way