How to perform the following insert, mysql - php

Question

I have two tables, reports and events, each table has a unique identifier called id with Auto increment, the problem is that the id in each table is not the same because a report can have events but maybe not. I would like to make a double insert but one column in each table must have an unique key. I do this with the following function:
function addactioneventuser(){
try {
$this->conn->beginTransaction();
$query = "INSERT INTO
" . $this->table_name . "
SET
case_id = ?,
from_to = 0,
action_id = ?,
accepted = 0,
message = ?";
// prepare query statement
$stmt = $this->conn->prepare($query);
// bind values
$stmt->bindParam(1, $this->case_id);
$stmt->bindParam(2, $this->action_id);
$stmt->bindParam(3, $this->message);
// execute the query
$stmt->execute();
// insert event query
$query2 = "INSERT INTO event_case
SET
title = ?, body = ?, class = ?, start = ?, end = ?, case_id= ?, worker_id = ?";
// prepare query statement
$stmt = $this->conn->prepare($query2);
// bind values
$stmt->bindParam(1, $this->title);
$stmt->bindParam(2, $this->body);
$stmt->bindParam(3, $this->class_event);
$stmt->bindParam(4, $this->start);
$stmt->bindParam(5, $this->end);
$stmt->bindParam(6, $this->case_id);
$stmt->bindParam(7, $this->worker_id);
// execute the query
$stmt->execute();
$this->conn->commit();
return true;
} catch (Exception $e) {
$stmt->rollBack();
return false;
}
}
The two inserts works perfectly but my problem is that the two ids for each table are not the same and as a consequence I can not delete at the same time an specific record from both tables and I don't know how to do it. I read about Cascade and other possible solutions but none of them seem pausible for my problem. I don't mind to create another column to use it as reference for both tables but I don't know how to do it in the above query.
Thank you in advance

Answer 1

Last insert id is $this->conn->insert_id;
You can get it after the operation and use the identifier.
For example to add it to the desired table