PHP MYSQL方向誤差

Question

[31-Oct-2014 12:47:24 UTC] PHP Warning: include_once(../connect/con.php) [<a href='function.include-once'>function.include-once</a>]: failed to open stream: No such file or directory in /home/denzw681/public_html/u/userPages/check_login_status.php on line 3 
[31-Oct-2014 12:47:24 UTC] PHP Warning: include_once() [<a href='function.include'>function.include</a>]: Failed opening '../connect/con.php' for inclusion (include_path='.:/opt/alt/php53/usr/share/pear:/opt/alt/php53/usr/share/php') in /home/denzw681/public_html/u/userPages/check_login_status.php on line 3 
[31-Oct-2014 12:47:24 UTC] PHP Notice: Undefined variable: con in /home/denzw681/public_html/u/userPages/check_login_status.php on line 26 
[31-Oct-2014 12:47:24 UTC] PHP Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /home/denzw681/public_html/u/userPages/check_login_status.php on line 15 
[31-Oct-2014 12:47:24 UTC] PHP Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, null given in /home/denzw681/public_html/u/userPages/check_login_status.php on line 16 

我的文件夾是這樣的：

>>的public_html/U /連接/ con.php

>>的public_html/U/userPages/check_login_status.php

>>的public_html/U/userPages/php_parsers/photo_system.php

不知道如何解決這個問題（

我可以添加文件代碼，如果需要回答這個問題。

P.S.網站是http://www.U.example.com/

Answer 1

你可以嘗試使用你的網站的根目錄，具有：

include_once($_SERVER['DOCUMENT_ROOT']."/u/connect/con.php"); 

或者你可以使用魔術常量：

define('ROOT_PATH', dirname(dirname(__FILE__))); 

• 來源：PHP - Document_Root vs Sub-Domains

Answer 2

你給連接的正確路徑嘗試

include_once('../../connect/con.php'); 

，或者在共同文件中定義您的網站的網址類似的header.php

define('SITEURL', 'http://example.com/u/'); 

，並使用此效果會更好包含文件

include_once(SITEURL.'connect/con.php');