pg_get_notify() gets notifications generated by a NOTIFY SQL command. To receive notifications, the LISTEN SQL command must be issued.
PostgreSQL database connection resource.
An optional parameter that controls how the returned array is indexed. result_type is a constant and can take the following values: PGSQL_ASSOC, PGSQL_NUM and PGSQL_BOTH. Using PGSQL_NUM, pg_get_notify() will return an array with numerical indices, using PGSQL_ASSOC it will return only associative indices while PGSQL_BOTH, the default, will return both numerical and associative indices.
An array containing the NOTIFY message name and backend PID. Otherwise if no NOTIFY is waiting, then FALSE is returned.