Get the last id before insert ZF2 - php

Question

I am trying to implement an action that can get me the last inserted id before I insert a record.
The action is basically supposed to get the last inserted id, then i add 1 to it then the value will be used in the current data been inserted.
This how far I have gotten and the error am getting
//the action to get the last inserted id
public function getLastID(){
$lastcourseid = $this->tableGateway->select(function (Select $select){
$select->columns(array('id'));
$select->order('id ASC')->limit(1);
});
var_dump($lastcourseid);
return $lastcourseid;
}
I call the function here before saving
if($id == 0){
$data['course_code'] = $this->getLastID();
$this->tableGateway->insert($data);
}else{
if($this->getAlbum($id)){
$this->tableGateway->update($data, array('id' => $id));
}else{
throw new \Exception("Form id does not exist");//an error is thrown in case the id is not found
}
}
This is the error am getting
Catchable fatal error: Object of class Zend\Db\ResultSet\ResultSet
could not be converted to string
I do not know where am going wrong.
Any help will be appreciated. Thanks

Answer 1

There is no such thing like "last id before insert".
And you don't need it.
First insert a record and then get your id. This is how it works.

Answer 2

You do not mention the underlying database (postgressql, mysql, etc.). I am more familiar with MySQL. The Perl and php AIP's have "last row id" functions. For example, php has "mysqli_insert_id()". This assumes that your rowID is an AUTO_INCREMENT column. Other DBs may have different requirements.