当使用readdir返回空字符串时

Question

I am using readdir in the following code to get a list of all file names of images in a directory.

while (false !== ($entry = readdir($frameDir))){
    $shapeName = explode('.',$entry);
    if (!empty($shapeName[0]) && $shapeName[0] != '.' && $shapeName[0] != '..' &&     $shapeName[0] != '/'){
        $shapeName = $shapeName[0];
        $shapes['frames'][] = $shapeName;
    }

After this code the script appends the '.png' to make it a valid file name.

As you can see I've tried to eliminate any chances of a blank file name being passed. Though when I run the script I end up getting a blank directory "/shapes/frame/.png" . This only happens for this particular directory. When I use the code on another of the three directories I get results as expected, and the code is the same logic as what is used above.

while (false !== ($entry = readdir($frameDotDir))){
    $shapeName = explode('.',$entry);
    if (!empty($shapeName[0]) && $shapeName[0] != '.' && $shapeName[0] != '..' &&     $shapeName[0] != '/'){
        $shapeName = $shapeName[0];
        $shapes['frame_dots'][] = $entry;
    }
}

When checking the filesystem on the server, I can't find any files with blank names.

I am wondering what could be causing my script to be reading blank file names from the diretory.

Answer 1

File names cannot be empty (and will not). You did something wrong in your code. It should look like:

while ($entry = readdir($frameDir)){
    // skip files which names starting with a dot
    // like '.', '..' or hidden files
    if (strpos($entry, '.') !== 0) {
        $shapes['frame_dots'][] = $entry;
    }
}

You see, less is more ;)