闲暇没事学习了一些php，结果今天连接库时怎么也连接不上，整整弄了一天总与找到一遍文章这才搞定:/shazi129/blog/item/e7aab644c8cd0c4a510ffeb1.html
上网查询得：把php_mysql.dll复制到php的ext文件中，把libmysql.dll复制到c盘的windows下。回到找我的php安装目录。里面并没有ext文件夹(我是安装的php，不是解压缩的)，于是我怀疑安装有问题。立马重新安装一遍(直接覆盖就可以)，果然发现，我安装的时候那些数据库默认的都是不加载的。重新安装了一遍这些文件都有了，按以上的方法进行了配置，查看了php的加载项(可以用echo phpinfo();查看php都加载了那些控件)结果还是不行，php并没有加载mysql，于是继续查找资料。找php的配置文件php.ini,因为我的php是安装的所以php.ini自动配置好了全部，并没有问题。(如果你是解压缩的需要手动配置mysql的相关内容：
[MySQL]
; Allow or prevent persistent links.
mysql.allow_persistent = On
; Maximum number of persistent links. -1 means no limit.
mysql.max_persistent = -1
; Maximum number of links (persistent + non-persistent). -1 means no limit.
mysql.max_links = -1-->最多连接数
; Default port number for mysql_connect(). If unset, mysql_connect() will use
; the $MYSQL_TCP_PORT or the mysql-tcp entry in /etc/services or the
; compile-time value defined MYSQL_PORT (in that order). Win32 will only look
; at MYSQL_PORT.
mysql.default_port =3306---->端口号
; Default socket name for local MySQL connects. If empty, uses the built-in
; MySQL defaults.
mysql.default_socket =
; Default host for mysql_connect() (doesn't apply in safe mode).
mysql.default_host =localhost----->服务器地址
; Default user for mysql_connect() (doesn't apply in safe mode).
mysql.default_user =root--->数据库用户名
; Default password for mysql_connect() (doesn't apply in safe mode).
; Note that this is generally a *bad* idea to store passwords in this file.
; *Any* user with PHP access can run 'echo get_cfg_var("mysql.default_password")
; and reveal this password! And of course, any users with read access to this
; file will be able to reveal the password as well.
mysql.default_password =root---->数据库登录密码
; Maximum time (in seconds) for connect timeout. -1 means no limit
mysql.connect_timeout = 60----->连接超时时间
; Trace mode. When trace_mode is active (=On), warnings for table/index scans and
; SQL-Errors will be displayed.
mysql.trace_mode = off
。。。。。。
[PHP_MYSQL]
extension=php_mysql.dll------>加载mysql库
[PHP_MYSQLI]
extension=php_mysqli.dll------>加载mysql扩展库
)
一切都弄完了，结果还是不行，无奈的只有少做暂停。。。。。。。
终极解决方案是：把php中的libmysql.dll文件复制到Apache的bin里面，测试，ok了
$link = @mysql_connect("localhost","root","root") or die("数据库链接失败！");
if($link){echo "链接成功";}else{echo "链接失败2";}
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