1.启用mysql功能,在php.ini中
extension=php_mysql.dll
extension=php_mysqli.dll
2. 修改extension_dir = "ext"，去掉前面的“;”，并改成extension_dir ="ext路径"，比如我是extension_dir = "E:/apache_php_mysql_appadmin/php-5.6.22-Win32-VC11-x64/ext"即可测试！
3.测试代码：
<?php
$conn=mysql_connect("localhost","root","root");
if($conn){
echo "连接mysql数据库ok";
}else{
echo "连接数据库失败";
}
?>
原文：http://www.cnblogs.com/weibingo/p/5553543.html