// connect DB
$dsn = array(
	'phptype'  => 'mysql',
	'username' => '---username---',
	'password' => '---password---',
	'hostspec' => '---host---',
	'database' => '---db name---'
);
$options = array(
    'portability' => MDB2_PORTABILITY_ALL
);
function errorHandler($error){
	die( "エラー発生　{$error->getMessage()}" );
}
PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'errorHandler');
$mdb2 =& MDB2::connect($dsn, $options);
$sql = 'set names utf8';
$res =& $mdb2->query($sql);
$mdb2->setFetchMode(MDB2_FETCHMODE_ASSOC);

MySQL: start connecting to MySQL with PEAR::MDB2

PHP