PHP Case Insensitive Version of file_exists()

Question

I\'m trying to think of the fastest way to implement a case insensitive file_exists function in PHP. Is my best bet to enumerate the file in the directory and do a strtolowe

Answer 1

I have improved John Himmelman's function and come up with this:
suppose that i have a catch system \iMVC\kernel\caching\fileCache

function resolve_path($path)
{
    # check if string is valid
    if(!strlen($path)) return FALSE;
    # a primary check
    if(file_exists($path)) return $path;
    # create a cache signiture
    $cache_sig = __METHOD__."@$path";
    # open the cache file
    $fc = new \iMVC\kernel\caching\fileCache(__CLASS__);
    # check cache file and validate it
    if($fc->isCached($cache_sig) && file_exists($fc->retrieve($cache_sig)))
    {
        # it was a HIT!
        return $fc->retrieve($cache_sig);
    }
    # if it is ab
    $is_absolute_path = ($path[0] == DIRECTORY_SEPARATOR);
    # depart the path
    $path_parts = array_filter(explode(DIRECTORY_SEPARATOR, strtolower($path)));
    # normalizing array's parts
    $path_parts = count($path_parts)? array_chunk($path_parts, count($path_parts)) : array();
    $path_parts = count($path_parts[0])?$path_parts[0]:array();
    # UNIX fs style
    $resolved_path = $is_absolute_path ? DIRECTORY_SEPARATOR : ".";
    # WINNT fs style
    if(string::Contains($path_parts[0], ":"))
    {
        $is_absolute_path = 1;
        $resolved_path = $is_absolute_path ? "" : ".".DIRECTORY_SEPARATOR;
    }
    # do a BFS in subdirz
    foreach ($path_parts as $part)
    {
        if (!empty($part))
        {
            $target_path = $resolved_path.DIRECTORY_SEPARATOR.$part;
            if(file_exists($target_path))
            {
                $resolved_path = $target_path;
                continue;
            }
            $files = scandir($resolved_path);

            $match_found = FALSE;

            foreach ($files as $file)
            {   
                if (strtolower($file) == $part)
                {
                    $match_found = TRUE;
                    $resolved_path = $resolved_path.DIRECTORY_SEPARATOR.$file;
                    break;
                }
            }
            if (!$match_found)
            {
                return FALSE;
            }
        }
    }
    # cache the result
    $fc->store($target_path, $resolved_path);
    # retrun the resolved path
    return $resolved_path;
}