Folders Tree in php - php

Question

I want to list the contents of a folder in php.
But i would like to display only the folder and not the files.
In addition, i would like to display a maximum of one sub-folder!
Could you help me please !
My code :
<?php
function mkmap($dir){
echo "<ul>";
$folder = opendir ($dir);
while ($file = readdir ($folder)) {
if ($file != "." && $file != "..") {
$pathfile = $dir.'/'.$file;
echo "<li><a href=$pathfile>$file</a></li>";
if(filetype($pathfile) == 'dir'){
mkmap($pathfile);
}
}
}
closedir ($folder);
echo "</ul>";
}
?>
<?php mkmap('.'); ?>

Answer 1

Pass the maximum recursion level to the function. This way you can decide how many levels deep you want to go, at runtime.
Also, it would be a good idea (I think) to have the "I want the dirs or maybe not" decision done externally and passed as a parameter. This way one function can do both.
And finally it's rarely a good idea having a function output HTML. It's best to return it as a string, so that you're more free to move code around. Ideally, you want to have all your logic separated from your presentation View (and more than that; google 'MVC').
Even better would be to pass a HTML template to the mkmap function and have it use that to create the HTML snippet. This way, if in one place you want a <ul> and in another a <ul id="another-tree" class="fancy">, you needn't use two versions of the same function; but that's probably overkill (you might do it easily with str_replace, or XML functions, though, if you ever need it).
function mkmap($dir, $depth = 1, $only_dirs = True){
$response = '<ul>';
$folder = opendir ($dir);
while ($file = readdir ($folder)) {
if ($file != '.' && $file != '..') {
$pathfile = $dir.'/'.$file;
if ($only_dirs && !is_dir($pathfile))
continue;
$response .= "<li>$file</li>";
if (is_dir($pathfile) && ($depth !== 0))
$response .= mkmap($file, $depth - 1, $only_dirs);
}
}
closedir ($folder);
$response .= '</ul>';
return $response;
}
// Reach depth 5
echo mkmap('Main Dir', 5, True);
// The explicit check for depth to be different from zero means
// that if you start with a depth of -1, it will behave as "infinite depth",
// which might be desirable in some use cases.
Templating
There's many way of templating the function, but maybe the simplest is this (for more elaborate customization, XML is mandatory - managing HTML with string functions has nasty space-time continuum implications):
function mkmap($dir, $depth = 1, $only_dirs = True,
$template = False) {
if (False === $template) {
$template = array('<ul>','<li>{file}</li>','</ul>');
}
$response = '';
$folder = opendir ($dir);
while ($file = readdir ($folder)) {
if ($file != '.' && $file != '..') {
$pathfile = $dir.'/'.$file;
if ($only_dirs && !is_dir($pathfile))
continue;
$response .= str_replace(array('{path}','{file}'), array($pathfile, $file), $template[1]);
if (is_dir($pathfile) && ($depth !== 0))
$response .= mkmap($file, $depth - 1, $only_dirs, $template);
}
}
closedir ($folder);
return $template[0] . $response . $template[2];
}
The function works like before, but you can pass a further argument to customize it:
echo mkmap('Main Dir', 5, True, array(
'<ul class="filetree">',
'<li><img src="file.png" /><tt>{file}</tt></li>',
'</ul>'));

Answer 2

To check if a file is a folder use is_dir() function.
This recursive solution will list folders and subfolders :
<?php
function mkmap($dir){
$ffs = scandir($dir);
echo '<ul>';
foreach($ffs as $file){
if($file != '.' && $file!= '..' ){
$path=$dir.'/'.$file;
echo "<li><a href='".$path."'>$file</a></li>";
if(is_dir($dir.'/'.$file)) mkmap($dir.'/'.$file);
}
}
echo '</ul>';
}
mkmap('main dir');
?>