求教连接数据库问题，win8.1(X64)+IIS+php5.5.23+sqlserver2008R2

曾经的王者

本人新手刚学习PHP，遇到连接SQLSERVER2008R2数据库问题，环境win8.1(X64)+IIS8.5+php5.5.23+sqlserver2008R2(x64)
PHP文件能成功执行，但是执行phpinfo()并未发现sqlsrv，执行数据库连接后提示如下：
PHP Fatal error: Call to undefined function sqlsrv_connect() in E:\wwwroot\php.com\test\2.php on line 11
0 ]9 D9 B" c& K0 O2 W----------------代码如下---------------
: o  |' R# B7 `$ o$ x3 K! L<?php
- t  @! v7 `$ R  Z$serverName = "(local)";
9 E. d9 Z9 V( a/ l) P  $uid ="sa";
  $pwd = "mypwd123";
/ s' x4 n% g# _4 u
5 e' x* e1 g( Y4 b  E$connectionInfo = array("UID"=>$uid,"PWD"=>$pwd,"Database"=>"phpdb");

$conn = sqlsrv_connect( $serverName,$connectionInfo);
  if( $conn == false)
  {
) k1 f$ e% P  F/ r! R5 u  echo "连接失败！";
3 D+ x) C* V3 J5 `* Edie( print_r( sqlsrv_errors(), true));
  }
2 H. Y- ~( I/ p( S?>
+ F0 O3 K+ N! r3 M* y* Y  u-------------------------------------------------------------------------
+ d% T5 [& U  ~望高手指点迷津

php.net里下载php-5.5.24-nts-Win32-VC11-x64.zip
+ \0 A+ ]! Q8 B微软官网下载 解压SQLSRV32.EXE后，拷贝php_pdo_sqlsrv_55_nts.dll和php_sqlsrv_55_nts.dll 到PHP安装目录ext
4 j4 B' p" n  G7 x- Q! M- F并且修改了php.ini的配置文件extension=php_sqlsrv_55_nts.dll   
9 p( N' y6 F+ V1 {( H" ~  extension=php_pdo_sqlsrv_55_nts.dll
5 q2 z8 L/ e3 L+ {5 ~mssql.secure_connection = On