PHP：可以包含file

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在我的脚本中，我设置了包含路径（因此应用程序的另一部分也可以包含文件），检查文件是否存在，并包含它。

但是，在我设置包含路径后， file_exists（）报告该文件不存在，但我仍然可以包含相同的文件。

<？php $ include_path = realpath（'path / to / some / directory'）; if（！is_string（$ include_path）||！is_dir（$ include_path）） { return false; } set_include_path（ implode（PATH_SEPARATOR，数组（ $ include_path， get_include_path（））））; //引导程序文件位于：path / to / some / directory / bootstrap.php。 $ bootstrap ='bootstrap.php'; //返回bool（true）。 var_dump（file_exists（$ include_path。'/'。$ bootstrap））; //返回bool（false）。 var_dump（file_exists（$ bootstrap））; //这让我相信包含路径没有正确设置。 //但确实如此。接下来就是让我困惑的事情。 require_once $ bootstrap; //不仅没有错误，而且文件包含成功！

我可以编辑包含路径和包含文件而不提供绝对文件路径，但我无法检查它们是否存在存在与否。这真的很烦人，因为每次调用不存在的文件时，我的应用程序都会导致致命错误，或者最多是警告（使用 include_once（））。 / p>

不幸的是，关闭错误和警告不是一种选择。

任何人都能解释造成这种行为的原因吗？

解决方案

file_exists 除了说明文件是否存在外（允许脚本知道它存在），解析相对于cwd的路径。它不关心包含路径。

In my script, I set the include path (so another part of the application can include files too), check that a file exists, and include it.

However, after I set the include path, file_exists() reports that the file does not exist, yet I can still include the same file.

<?php $include_path = realpath('path/to/some/directory'); if(!is_string($include_path) || !is_dir($include_path)) { return false; } set_include_path( implode(PATH_SEPARATOR, array( $include_path, get_include_path() )) ); // Bootstrap file is located at: "path/to/some/directory/bootstrap.php". $bootstrap = 'bootstrap.php'; // Returns "bool(true)". var_dump(file_exists($include_path . '/' . $bootstrap)); // Returns "bool(false)". var_dump(file_exists($bootstrap)); // This led me to believe that the include path was not being set properly. // But it is. The next thing is what puzzles me. require_once $bootstrap; // Not only are there no errors, but the file is included successfully!

I can edit the include path and include files without providing the absolute filepath, but I cannot check whether they exist or not. This is really annoying as every time a file that does not exist is called, my application results in a fatal error, or at best a warning (using include_once()).

Turning errors and warnings off is not an option, unfortunately.

Can anyone explain what is causing this behaviour?

解决方案

file_exists does nothing more than say whether a file exists (and the script is allowed to know it exists), resolving the path relative to the cwd. It does not care about the include path.