The behaviour of these functions is affected by settings in php.ini.
| Name | Default | Changeable | Changelog | 
|---|---|---|---|
| pgsql.allow_persistent | "1" | PHP_INI_SYSTEM | |
| pgsql.max_persistent | "-1" | PHP_INI_SYSTEM | |
| pgsql.max_links | "-1" | PHP_INI_SYSTEM | |
| pgsql.auto_reset_persistent | "0" | PHP_INI_SYSTEM | Available since PHP 4.2.0. | 
| pgsql.ignore_notice | "0" | PHP_INI_ALL | Available since PHP 4.3.0. | 
| pgsql.log_notice | "0" | PHP_INI_ALL | Available since PHP 4.3.0. | 
Here's a short explanation of the configuration directives.
pgsql.allow_persistent
     boolean
    Whether to allow persistent Postgres connections.
pgsql.max_persistent
     integer
    The maximum number of persistent Postgres connections per process.
pgsql.max_links
     integer
    The maximum number of Postgres connections per process, including persistent connections.
pgsql.auto_reset_persistent
     integer
    Detect broken persistent links with pg_pconnect(). Needs a little overhead.
pgsql.ignore_notice
     integer
    Whether or not to ignore PostgreSQL backend notices.
pgsql.log_notice
     integer
    Whether or not to log PostgreSQL backends notice messages. The PHP directive pgsql.ignore_notice must be off in order to log notice messages.