检查某个目录是否存在于 PHP 中

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时间:2020-08-24 23:44:29  来源:igfitidea点击:

Check whether a Directory Exists in PHP

phpfile-io

提问by Graviton

I know, I know, this sounds sooeasy. But I can't seem to find the correct answer on the Internet.

我知道,我知道,这听起来容易。但我似乎无法在互联网上找到正确的答案。

One of the solution I found was to use is_dir.

我找到的解决方案之一是使用is_dir.

if(is_dir($dir))
  echo 'directory exists';
else
  echo 'drectory not exist';

But this is wrong-- All this function does is to check whether the $diris a directory, it doesn't check whether the directory exists, or not. In other words if I put:

但这是错误的——这个函数所做的只是检查是否$dir是一个目录,它不检查目录是否存在。换句话说,如果我把:

$rootDir = "C:\Documents and Settings\test\My Documents\Image Directory\Me Dog\";

then the function will return a true, even though you can find no such directory on your web server.

那么该函数将返回一个 true,即使您在您的 Web 服务器上找不到这样的目录。

Any ideas?

有任何想法吗?

回答by vartec

Should work correctly. From is_dir()documentation:

应该可以正常工作。从is_dir()文档:

Returns TRUE if the filename exists and is a directory, FALSE otherwise.

如果文件名存在并且是一个目录,则返回 TRUE ,否则返回FALSE。

Well, anyway if it doesn't try this:

好吧,无论如何,如果它不尝试这个:

if(file_exists($dir) && is_dir($dir))

BTW. results of these functions are cached in stat cache. Use clearstatcache()to clean that cache.

顺便提一句。这些函数的结果缓存在 stat 缓存中。使用clearstatcache()清理该缓存。

回答by Tim Post

You'll probably want to use opendir()after is_dir() agrees that the path (could) be a directory.

在 is_dir() 同意路径(可以)是目录之后,您可能想要使用opendir()

If the resource returned by opendir() is valid, you know you have a directory, and already have a handle to read it.

如果 opendir() 返回的资源有效,则您知道您有一个目录,并且已经有一个句柄可以读取它。

Just be sure to call closedir(), either way, if a valid handle is returned.

如果返回有效句柄,请务必调用 closedir(),无论哪种方式。

Edit:

编辑:

This answer assumes that you'll be opening the directory either way. If you just need to ensure a path is sane / valid, file_exists() is much cheaper.

此答案假定您将以任何一种方式打开目录。如果您只需要确保路径健全/有效,file_exists() 便宜得多。

回答by Bart S.

You could try this:

你可以试试这个:

if(is_dir($dir) && is_writeable($dir))
{
    // ...
}

回答by madhu

bool file_exists ( string $filename )

Checks whether a file or directory exists.

检查文件或目录是否存在。

http://php.net/manual/en/function.file-exists.php

http://php.net/manual/en/function.file-exists.php