Check whether a directory exists in PHP
Should work correctly. From is_dir() documentation:
Returns TRUE if the filename exists and is a directory, FALSE otherwise.
Well, anyway if it doesn't try this:
if(file_exists($dir) && is_dir($dir))BTW. results of these functions are cached in stat cache. Use clearstatcache() to clean that cache.
You'll probably want to use opendir() after is_dir() agrees that the path (could) be a directory.
If the resource returned by opendir() is valid, you know you have a directory, and already have a handle to read it.
Just be sure to call closedir(), either way, if a valid handle is returned.
Edit:
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.
bool file_exists ( string $filename )Checks whether a file or directory exists.