Other Features
There are a number of PostgreSQL-related PHP functions that I have not covered in this chapter.
Newer versions of PHP have added support for asynchronous query processing (see pg_send_query(), pg_connection_busy(), and pg_get_result()). Asynchronous query processing probably won't be of much use when you are constructing dynamic web pages, but clever coders can use asynchronous queries to provide intermediate feedback for long-running operations (sorry, I'm not that clever).
PHP offers a set of functions that can give you information about a database connection. We used the pg_dbname() function in the first client (see Listing 15.4) to display the name of the database to which we were connected. You can also use the pg_port()
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