(PHP 4 >= 4.0.6, PHP 5)
pg_last_notice — Returns the last notice message from PostgreSQL server
$connection
   )
   pg_last_notice() returns the last notice
   message from the PostgreSQL server on the specified
   connection. The PostgreSQL server sends notice
   messages in several cases, for instance when creating a SERIAL
   column in a table.
  
With pg_last_notice(), you can avoid issuing useless queries by checking whether or not the notice is related to your transaction.
Notice message tracking can be set to optional by setting 1 for pgsql.ignore_notice in php.ini.
Notice message logging can be set to optional by setting 0 for pgsql.log_notice in php.ini. Unless pgsql.ignore_notice is set to 0, notice message cannot be logged.
connectionPostgreSQL database connection resource.
   A string containing the last notice on the 
   given connection, or FALSE on error.
  
Example #1 pg_last_notice() example
<?php
  $pgsql_conn = pg_connect("dbname=mark host=localhost");
  
  $res = pg_query("CREATE TABLE test (id SERIAL)");
  
  $notice = pg_last_notice($pgsql_conn);
  
  echo $notice;
?>
The above example will output:
CREATE TABLE will create implicit sequence "test_id_seq" for "serial" column "test.id"