What is the error in this php? I didn't find the mistake

This is a snippet of code for smarty settings found online.

It prompts at the beginning
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in F:phpstudyWWWsmartysconfig.php on line 2
I saw that the second line was fine, so I typed it again, and it was the same.

Then it prompts
Parse error: syntax error, unexpected T_VARIABLE in F:phpstudyWWWsmartysconfig.php on line 4
This is very confusing, $tpl = new Smarty(); Is this sentence wrong?

Thank you.

<code><?php  
　　include "/smarty/libs/Smarty.class.php";  
　　define(@#__SITE_ROOT@#, @#f:/phpstudy/WWW/smartys/smarty@#); // 最后没有斜线  
　　$tpl = new Smarty();  
　　$tpl->template_dir = __SITE_ROOT . "/templates/";  
　　$tpl->compile_dir = __SITE_ROOT . "/templates_c/";  
　　$tpl->config_dir = __SITE_ROOT . "/configs/";  
　　$tpl->cache_dir = __SITE_ROOT . "/cache/";  
　　$tpl->left_delimiter = @#<{@#;  
　　$tpl->right_delimiter = @#}>@#;  
　　?></code>