This is the preferred driver for connections to Postgres databases version 8 and above

None

As of V5.21:

• ADOdb provides a constant, ADODB_DEFAULT_METATYPE, that assists in the use of Geometry Data Types.
• The setCustomMetaType() method allows the creation of Geometry types

$db->connect("host=host1 user=user1 password=secret port=4341");
$db->connect(null, $user='user1', $password='secret');

This driver is exactly the same as postgres9

This driver provides connections to PostgreSQL version 7 databases

This driver provides connections to PostgreSQL version 6.4 databases

This driver provides connections to PostgreSQL databases below version 6.4