php判断数据库是否连接成功的测试例子
如果出现数据库配置不正确的错误，请看php与MySQL的配置教程：
Win7系统下如何配置php-Apache-mysql环境 http://www.cnblogs.com/myall/p/4744837.html
<form action="" method="post">
<select name="host">
<option value="localhost" selected>localhost</option>
<option value="127.0.0.1">127.0.0.1</option>
</select>
<br><br>user:<input type="text" name="user" value=""><br><br>pwd:<input type="passWord" name="pwd" value=""><br><br>
<input type="submit" value="connent">
<input type="reset" value="reset">
</form>
<?phperror_reporting(~E_ALL);$host=$_POST['host'];$user=$_POST['user'];$pwd=$_POST['pwd'];if(isset($_POST['host']) &&isset($_POST['user']) &&isset($_POST['pwd'])){if(strlen($host)<1 orstrlen($user)<1 orstrlen($pwd)<1){echo"请完善相关数据库链接信息。";exit(0);
}$conn=mysql_connect($host,$user,$pwd) ordie("Error-数据库连接失败！");if($conn){echo"OK—数据库连接成功！";
}
}?>