pdo: align method signatures with parent class
pdo: align method signatures with parent class

ADODB_pdo_base MetaTables() and MetaColumns() now match the function
definition in ADODB_pdo, to avoid PHP notices (Pull request #62).

Signed-off-by: Damien Regad <d9b599957bd54c22143053c16557076ca2185dbd@mantisbt.org>

pyscht/ADOdb,paulproteus/ADOdb,paulproteus/ADOdb,andrewnicols/ADOdb,ipso/ADOdb,ipso/ADOdb,pyscht/ADOdb,andrewnicols/ADOdb