php.ini扩展开了，为什么找不到mysql模块，无法连接mysql啊

如题mysql也是可以连接的mysql> use test
Database changed
mysql> source e:/sql/DB.SQL;
Query OK, 0 rows affected (0.03 sec)php.ini里也打开了;
;extension=php_bz2.dll
;extension=php_curl.dll
;extension=php_fileinfo.dll
extension=php_gd2.dll
;extension=php_gettext.dll
;extension=php_gmp.dll
;extension=php_intl.dll
;extension=php_imap.dll
;extension=php_interbase.dll
;extension=php_ldap.dll
extension=php_mbstring.dll
;extension=php_exif.dll      ; Must be after mbstring as it depends on it
extension=php_mysql.dll
;extension=php_mysqli.dll
;extension=php_oci8.dll      ; Use with Oracle 10gR2 Instant Client
;extension=php_oci8_11g.dll  ; Use with Oracle 11gR2 Instant Client
;extension=php_openssl.dll
;extension=php_pdo_firebird.dll
extension=php_pdo_mysql.dll
;extension=php_pdo_oci.dll
;extension=php_pdo_odbc.dll
;extension=php_pdo_pgsql.dll
;extension=php_pdo_sqlite.dll
;extension=php_pgsql.dll
;extension=php_pspell.dll
;extension=php_shmop.dllphpinfo();显示里 只有mysqld：mysqlndmysqlnd enabled
Version mysqlnd 5.0.10 - 20111026 - $Id: e707c415db32080b3752b232487a435ee0372157 $
Compression supported
SSL supported
Command buffer size 4096
Read buffer size 32768
Read timeout 31536000
Collecting statistics Yes
Collecting memory statistics No
Tracing n/a
Loaded plugins mysqlnd,example,debug_trace,auth_plugin_mysql_native_password,auth_plugin_mysql_clear_password
API Extensions no valuemysqlnd statistics
bytes_sent