Thursday, August 12, 2010

PHP 5.3 无法连接 MySQL localhost 服务器问题

最近在 Windows 7 上搭建 WEB 开发环境,下载了各组建最新的版本:
  • Apache httpd 2.2.16
  • MySQL 5.1.49
  • PHP 5.3.3
  • phpMyAdmin 3.3.5

照常安装好以后,phpinfo() 运行一切正常但是在 phpMyAdmin 中却无法连接本机的 MySQL。点击“登录”按钮后,页面等待很长时间,然后出现白页。

经过多番搜寻,终于找到了问题的原因。PHP 升级到 5.3 版本后开始使用 native 的 MySQL 驱动,该驱动连接 MySQL 服务时的行为和之前的 libmysql.dll 有所区别,新驱动对 localhost 的解析,似乎是基于 Windows 自己的 hosts 文件的。而在 Windows Vista / Windows 7 以及 Windows Server 2008 上,hosts 文件里 localhost 解析为 ::1,而非传统的 127.0.0.1。开一个 CMD 的窗口执行 ping localhost 即可验证。从而导致函数 mysql_connect() 无法解析和链接到 localhost。

不仅 phpMyAdmin,用 PHP 5.3.x 在任何时候连接 MySQL 的 localhost 服务器都会出现类似问题,例如:
$db = new PDO('mysql:host=localhost;dbname=windia', DB_USER, DB_PASS);

解决的办法有两个:
  • 在代码中避免使用 localhost 而使用 127.0.0.1
  • 将 Windows 的 hosts 文件中
    ::1          localhost
    改为
    127.0.0.1    localhost

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