public static function get_read_conn()
{
if (self::$read_conn === null) {
$ds = array_merge(array(self::$daemons['master']), self::$daemons['slaves']);
shuffle($ds);
$d = $ds[0];
$dsn = $d['host'] . $d['user'] . $d['pass'] . $d['name'] . $d['port'];
if (isset(self::$conns[$dsn])) {
$conn = self::$conns[$dsn];
} else {
$conn = mysqli_connect($d['host'], $d['user'], $d['pass'], $d['name'], $d['port']);
if (!$conn) {
exit('Cannot connect to slave');
}
self::$conns[$dsn] = $conn;
}
self::$read_conn = $conn;
}
return self::$read_conn;
}
