昨天帮一朋友配置服务器结果发现apache日志中有PHP Warning: PHP Startup: Unable to load dynamic library 提示了，然后调试数据库连接发现提示Call to undefined function mysql_connect()错误，这样就想到了是mysql没有加载成功了，下面我们一起来看看问题解决办法。
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连接代码

<?php
echo 'a';
$cn = mysql_connect("localhost",'www.111cn.net','你的mysql用户密码') or die(mysql_error());
if( $cn )
{
echo phpinfo();
}
else
{
echo 'mysql connect fail';
}
?>

因为服务器使用的是安全php.ini所在没有错误显示，于时相看了apache安装目录的logs的errors.log日志文

件发现如下错误

PHP Warning: PHP Startup: Unable to load dynamic library

'D:\myserver\php\ext\php_mysql.dll' - xd5xd2xb2xbbxb5xbdxd6xb8xb6xa8xb5xc4xc4

xa3xbfxe9xa1xa3rn in Unknown on line 0
PHP Warning: PHP Startup: Unable to load dynamic library

'D:\myserver\php\ext\php_mysqli.dll' - xd5xd2xb2xbbxb5xbdxd6xb8xb6xa8xb5xc4

xc4xa3xbfxe9xa1xa3rn in Unknown on line 0

[Tue Dec 31 09:05:15 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 2, referer: www.111cn.net[Tue Dec 31 09:05:16 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 2, referer: http://localhost/
[Tue Dec 31 09:05:17 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 2, referer: http://localhost/
[Tue Dec 31 09:06:04 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 3, referer: http://localhost/
[Tue Dec 31 09:06:05 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 3, referer: http://localhost/
[Tue Dec 31 09:06:05 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 3, referer: http://localhost/
[Tue Dec 31 09:06:05 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 3, referer: http://localhost/
[Tue Dec 31 09:06:06 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 3, referer: www.111cn.net

[Tue Dec 31 09:06:06 2013] [error] [client 127.0.0.1] PHP Fatal error: Call to undefined

function mysql_connect() in E:\www\a.php on line 3, referer: http://localhost/

日志中有这么一句

PHP Startup: Unable to load dynamic library 'D:\myserver\php\ext\php_mysql.dll' 这个意思是

没有加载成功php_mysql文件了，还有一点是提示 PHP Fatal error: Call to undefined function

mysql_connect(),，这个是mysql没有连接成功也就是加载mysql库失败了，根据分析有两种可能一是文件不

存在，这个问题不存因为我以前用的是这个php解压包，2是服务器环境变量问题，如果是环境变量有两种解

决办法

1，是直接在windows增加环境变量

2，直接把在d:PHP里找到php5ts.dll,libmysql.dll将其复制到c:/winnt/system32下(winNT/2000的机器),

而winXP/2003是复制到c:/windows/system32下即可

记住复制到system目录之后必须重记apache环境，如我再测试http://localhost/a.php 就可以看到