测试MySQL连接

源代码如下
<html>
<head>
<title>测试MySQL连接</title>
</head>
<body>
<?php
$link=mysql_connect("localhost", "root", "123456");
if(!$link) die("连接MySQL服务器失败: " . mysql_error());
echo "<h3>连接MySQL服务器成功!</h3>";
mysql_close($link);
?>
</body>
</html>
错误提示如下
Fatal error: Call to undefined function mysql_connect() in E:\Apache2.2\htdocs\chap01\page1-02.php on line 7