如题，刚下载thinkPHP放在thinkphp目录下运行就出现这个错误：

Warning: Unexpected character in input: '\' (ASCII=92) state=0 in C:\AppServ\www\thinkphp\ThinkPHP\ThinkPHP.php on line 97

Parse error: syntax error, unexpected T_STRING in C:\AppServ\www\thinkphp\ThinkPHP\ThinkPHP.php on line 97
什么原因？自己查了下网上说要安装zendoptimizer