mysql_connect (PHP 4, PHP 5)
mysql_connect — Open a connection to a MySQL Server
Warning This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:


mysqli_connect()
PDO::__construct()

http://php.net/manual/en/function.mysql-connect.php

在PHP5.5.0中被拋棄，在將來的版本會徹底移除！

This extension is deprecated as of PHP 5.5.0,
整個mysql擴展在PHP5.5中都已經被拋棄，不推薦使用了。

 robertpas550 at hotmail dot com ¶
3 years ago
New users are advised to use MySQL Improved mysqli_ functions rather than the older [replaced] mysql_ functions where applicable and subject the appropriate latest stable versions of Apache, php and MySQL, etc.

所有的mysql擴展頁面都掛上了醒目的紅框框：
Warning
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:

    mysqli_affected_rows()
    PDOStatement::rowCount()

我們參考書上是講用mysqli，老師課上講用PDO

mysqli也是物件導向的php庫。
而MySQL僅僅是一對函數，雖然c語言裡面也是這些函數。

剛開始用MySQL的時候我很不習慣，因為是字符控制台界面的。但現在我倒是覺得比Microsoft access好太多了。

mysqli在國內的某本書上介紹過。

其实MySQLi库我只用过一次
2010.7那次