pg_get_pid() gets the backend's (database server
process) PID. The PID is useful to determine whether or not a NOTIFY
message received via pg_get_notify() is sent from another process
or not.
Parameters
connection
PostgreSQL database connection resource.
Return Values
The backend database process ID.
Examples
Example 1. PostgreSQL backend PID
<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
echo "An error occured.\n";
exit;
}
// Backend process PID. Use PID with pg_get_notify()
$pid = pg_get_pid($conn);
?>