PHP在多个目录中输出多个文件

Question

I have a main directory called PDFS that has 5 sub directories representing years(2011, 2012, 2013, 2014, 2015). In each "year directory" are 11 pdfs. I need to access the PDFS directory and get all "year directories", and then get all pdfs in each "year directory" to display on a page. So for example the pdfs in the 2011 "year directory" will be listed under a 2011 heading. Same with 2012, 2013 etc. I've tried many different things. I can output the "year directories" using scandir(). I can output the files in a single "year directory" using a foreach loop and glob(). I can't for the life of me figure out how to output each "year directory's" files other than doing multiple foreach loops using glob() on each "year directory". There's gotta be a more dynamic way to set this up. Any suggestions? I feel like I would need some kind of foreach inside of a foreach? Here's what I'm working with:

//set main directory
$dir = 'PDFS';

//gets sub directories of PDFS directory
$directories = scandir($dir);

//removes the first to indexes in the directories array that are just dots
unset($directories[0]);
unset($directories[1]);

//outputs an array of the sub directories from scandir() starting at index 2
print_r($directories);

//initialize $i variable for loop
$i=0;

//if I manually set the $dir variable to "PDFS/2011/*" this will output links
//to each pdf inside the 2011 year directory
    foreach(glob($dir) as $file) {
        $i++;
        echo "<a href='$file'>$file</a><br />";
    }

Answer 1

You were on the right track, this piece of code should do the trick:

//set main directory
$mainDir = 'PDFS';

//gets sub directories of PDFS directory
$subDirectories = scandir($mainDir);

//removes the first two indexes in the directories array that are just dots
unset($subDirectories[0]);
unset($subDirectories[1]);

// first loop through all sub directories ...
foreach($subDirectories as $subDirectory) {
    echo '<h1>'.$subDirectory.'</h1>';
    // ... and then loop through all files in each sub directory
    foreach(glob($mainDir.'/'.$subDirectory.'/*') as $file) {
        echo "<a href='$file'>$file</a><br />";
    }
}

I changed some of the var names for better understanding.

A few things:

• There is no need for the counting var i as you use a foreach.

• If you set a string together manually, then try to generate it step-by-step and just compare the generated with the manual one until it fits. (You connect two strings with a dot . )

• You can configure the glob function, so that it only finds certain file types ( *.pdf ).