zendframework找不到pdo_mysqlPHP Warning: Cannot load module 'pdo_mysql' because required module 'pdo' 
zend framework找不到pdo_mysql PHP Warning: Cannot load module 'pdo_mysql' because required module 'pdo' is no
t loaded in Unknown on line 0
求大神指点,为啥在windows dos 模式下输入php -v 老是提示上面问题呢!害的我zend framework都无法使用!