(PHP 5 >= 5.6.0, PHP 7)
pg_connect_poll — Poll the status of an in-progress asynchronous PostgreSQL connection attempt
pg_connect_poll ( resource $connection ) : int
pg_connect_poll() polls the status of a PostgreSQL connection created by calling pg_connect() with the PGSQL_CONNECT_ASYNC option.
connection
PostgreSQL database connection resource.
Returns PGSQL_POLLING_FAILED, PGSQL_POLLING_READING, PGSQL_POLLING_WRITING, PGSQL_POLLING_OK, or PGSQL_POLLING_ACTIVE.
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https://www.php.net/manual/en/function.pg-connect-poll.php