Example of a Static Class

ExampleDatabase.php

<?php
class ExampleDatabase {

    static private $db = null;

    static public function connect($connection_string)
    {
        return self::$db = pg_connect($connection_string);
    }

    static public function query($query)
    {
        return pg_query(self::$db, $query);
    }
}


/* configuration */
ExampleDatabase::connect('dbname=testing');

/* usage */
$result = ExampleDatabase::query('SELECT * FROM users');