Fatal error: Uncaught Error: Call to undefined function function_tool() in D:\wwwroot\jfcb.net\ThinkPHP\ThinkPHP.php:15 Stack trace: #0 D:\wwwroot\jfcb.net\index.php(7): require() #1 {main} thrown in D:\wwwroot\jfcb.net\ThinkPHP\ThinkPHP.php on line 15