Fatal error: Uncaught Error: Call to undefined function function_tool() in D:\wwwroot\changhan.com\ThinkPHP\ThinkPHP.php:15
Stack trace:
#0 D:\wwwroot\changhan.com\index.php(5): require()
#1 {main}
thrown in D:\wwwroot\changhan.com\ThinkPHP\ThinkPHP.php on line 15