Question

为什么我的php扩展显示开启了mssql，但是通过phpinfo查看却没有mssql

php扩展显示已经有mssql了

Answer 1

去看下extension_dir目录是否有配置文件

追问

有啊，我已经把文件放到那个目录下了，看问题补充

Answer 2

最好的看下 php.ini的文件 看看 extension=php_mysqli.dll 前面是不是去掉了;号 并且看看 php.ini下面是不是有如下的数据，如果没有就要加上
[MySQLI]

; Maximum number of links. -1 means no limit.
mysqli.max_links = -1

; Default port number for mysqli_connect(). If unset, mysqli_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.
mysqli.default_port = 3306

; Default socket name for local MySQL connects. If empty, uses the built-in
; MySQL defaults.
mysqli.default_socket =

; Default host for mysql_connect() (doesn't apply in safe mode).
mysqli.default_host =

; Default user for mysql_connect() (doesn't apply in safe mode).
mysqli.default_user =

; Default password for mysqli_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("mysqli.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.
mysqli.default_password =

; Allow or prevent reconnect
mysqli.reconnect = Off

希望我的回答对你有用
-----君少