資料庫連線與選擇

• Mysql
• $link = mysql_connect('localhost', 'username', 'passwd');
• mysql_select_db('dbname', $link);
• Mysqli
• $mysqli = new mysqli("localhost", "user", "password", "dbname");
• Postgresql
• $link = pg_connect("host=localhost dbname=dbname user=userid password=xxxx");
• PDO
• $link =new PDO('mysql:dbname=dbname;host=localhost;', 'username','pwd');