PHP and ODBC

While looking for something else in the Moodle Forums, I found these links that refer to the underlying way Moodle connects to databases using ODBC . 
 “adodb just harnesses the underlying PHP functions for whatever type of connection you use, so it helps to be familiar with how they work.” 
 http://uk.php.net/odbc 
 http://www.phpfreaks.com/tutorials/61/0.php 
 http://phplens.com/phpeverywhere/node/view/9 
 http://bryanmills.net:8086/archives/2003/11/microsoft-access-database-using-linux-and-php/ 
 (Links taken from this Moodle Forums post. http://moodle.org/mod/forum/discuss.php?d=74133 ) 
 https://kb.ucla.edu/link/1088 
 Please add more, if you find any.