Apparently this function does not return the database name given in the connection string. I tried this on apache 2.x/php4.3.x/pg7.4.x and apache 1.3.x/php5.x/pg8rc1 and saw this behavior on both setups.
pg_options
(PHP 4, PHP 5)
pg_options — Retorna as opções associadas com a conexão
Descrição
string pg_options
( resource
$connection
)
pg_options() retornará uma string contendo as opções
especificadas no recurso (resource) de conexão PostgreSQL
connection.
Robert Treat <xzilla at sourceforge> ¶
8 years ago
