PDO::lastInsertId — Returns the ID or sequence value of the last inserted row (PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)
string PDO::lastInsertId ([ string $name = NULL ] )
Returns the ID of the last inserted row, or the last value of a sequence object, depending on the underlying driver. For example, PDO_PGSQL() requires the name of the sequence object to be specified for the name parameter.
Note: This method may not return a meaningful or consistent result between different PDO drivers because the underlying database may not support the concept of auto-incrementing fields or sequences.
name should return the name of the sequence object whose ID should be returned.
If no sequence name is specified for the name parameter, PDO::lastInsertId() returns a string representing the row ID of the row last inserted into the database.
If a sequence name is specified for the name parameter, PDO::lastInsertId() returns a string representing the last value retrieved from the specified sequence object.
If the current PDO driver does not support this feature, PDO::lastInsertId() triggers an IM001 SQLSTATE.