correct function to get primary key

pg4wp/driver_pgsql.php

@@ -473,7 +473,7 @@ function get_primary_key_for_table(&$connection, $table)
         FROM   pg_index i
         JOIN   pg_attribute a ON a.attrelid = i.indrelid
                             AND a.attnum = ANY(i.indkey)
-        WHERE  i.indrelid = 'tablename'::regclass
+        WHERE  i.indrelid = '$table'::regclass
         AND    i.indisprimary
     SQL;