在PHP字符串变量中使用OUTPUT子句时，SQL输出值在哪里？

I am trying to retrieve an auto-incremented value that is created upon insertion. This ID value will be used in a SELECT statement later, so it would be nice to know what it is when I insert instead of writing another query. The problem is that I don't know where OUTPUT clause outputs it. The query is in the form of a PHP string variable.

I'm new to SQL and PHP, so I'm not really sure what to try. I just need some help understanding.

$query = "INSERT INTO Table1 (orderNumber, revisionNumber, creationDate...)"
. " OUTPUT Inserted.ID"
. " VALUES (blah, blah, blah...)";
execute_query($query);