經常在php頁面中利用include, require, require_once包含了一些其他位置的頁面時，會出現錯誤，例如沒有發現次頁面，或權限不允許等，可以根據以下方法來排除
1. 出現「未找到檔案「類似的錯誤時候，檢查include檔案的位置是否正確，下面引用php手冊頁面的原話：
Files for including are first looked in include_path relative to the current working directory and then in the directory of the current script. E.g. if your include_path is braries_path , current working directory is /www/, you included include/a.php and there is include "b.php" in that file, b.php is first looked in /www/libraries/ and then in /www/include/. If filename begins with ./ or ../, it is looked only in include_path relative to the current working directory.
2. 當出現permission deny 類似錯誤的時候，按以下方法排除
a) 檢測被包含的檔案讀取權限是否開啟
b) 偵測被包含的檔案路徑上的每個目錄的x權限是否打開，該權限決定了目錄能否被瀏覽。
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