php - PDO lastInsertId() -

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i'm using pdo on mysql database , try retrive lastinsertid().

i thought going last inserted vlue in column id in table primary_key. however, 0 output 

        $statement = "select last_insert_id() my_table";         $sql = $dbh->query($statement);         $lastid = $sql->fetch(pdo::fetch_num);         $lastid = $lastid[0];         return $lastid;

pdo class has method called lastinsertid(). can use method after inserting record/records collect last insert id.


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