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hierarcy navigation - PHP without frames
this example from a Well House Consultants training course
More on this [link]
Source code: dpd.php4 Module: W507
<?php

# Demonstration of navigating through a directory hierarcy
# Uses sessions so that several visitors can be selecting at the same time

session_start();

function expand_dir($sd,$nlev) {
        global $tree;
        $contains = opendir($sd);
        while ($current = readdir($contains)) {
                if (ereg('^\.',$current)) continue;
                $full = "$sd/$current";
                if (is_dir($full)) {
                        array_push($tree,"$nlev 1 0 $full");
                        expand_dir($full,$nlev+1);
                } else {
                        array_push($tree,"$nlev 0 0 $full");
                }
        }
        }

# If this is a new session, set up the directory tree with nothing selected

if (! $_SESSION[running]) {
        $source = "../../trainee";
        $tree = array("0 1 1 $source");
        expand_dir($source,1);
        $_SESSION[tree] = $tree;
        $_SESSION[running] = 1;
}

# Deal with any selection / deselection items

$elat = -1;
if ($_GET[ac] != "") {
for ($k=0; $k<count($_SESSION[tree]); $k++) {
        list($level,$isdir,$shown,$value) = explode(" ",$_SESSION[tree][$k]);
        if ($value == $_GET[el]) {
                $shown = ($_GET[ac] == "ex") ? 1 : 0;
                $_SESSION[tree][$k] = implode(" ",array($level, $isdir, $shown, $value));
                $elat = $k;
                }
        }
}

# Parse data, making up offer tree and selected HTML strings

$showing = 0;
$position = 0; $hvname=0;
$chosen = array();
$offer = array();
foreach ($_SESSION[tree] as $element) {
        $position++;
        $bold = 0;
        list($level,$isdir,$shown,$value) = explode(" ",$element);
        if ($isdir) {
                if ($shown) {
                $showing = 1;
                $flag = "<a href=$PHP_SELF?ac=sh&el=$value#here>-</a>";
                } else {
                $flag = "<a href=$PHP_SELF?ac=ex&el=$value#here>+</a>";
                $showing = 0;
                }
                if (! $level) $flag = "&nbsp;";
        } else {
                if ($shown) {
                $flag = "<a href=$PHP_SELF?ac=sh&el=$value#here>DeSelect</a>";
                array_push($chosen,$value);
                $bold = 1;
                } else {
                $flag = "<a href=$PHP_SELF?ac=ex&el=$value#here>Select</a>";
                }
        }
        $prefix = str_repeat("&nbsp;",$level * 2+(2-$isdir));
        $mrs = "";
        if ($isdir or $shown or $showing) {
                # following line need revisiting - when do subdirectories show??
                # if (! ($isdir == 1 and $shown == 0 and $level > 0)) { # Test
                if ($hvname == 0 and $position > $elat and $elat >= 0) {
                        $value = "<a name=here>$value</a>";
                        $mrs = " &lt;------- most recent selection";
                        $hvname = 1;
                }
                if ($bold == 0) {
                        array_push($offer,"$prefix $flag $value $mrs");
                } else {
                        array_push($offer,"$prefix $flag <b>$value</b> $mrs");
                        }
                }
                # }
        }

$word = "Currenly";
if ($_GET[done]) {
        session_destroy();
        $word = "Finally";
}
######################################## Response page ####################################
?>
<html><head><title>File Selector System</title></head>
<body>This demonstration lets you navigate through a directory tree, expanding and contracting
directories and selecting files of your choosing. When you select the DONE button, you'll get
a report of all the items selected in more detail.<br><br>
<b><?= $word ?> Selected</b><br>
<?php if (count($chosen)) {
     print (implode("<br>",$chosen));
} else {
     print "No selections yet made";
} ?>
<?php if (! $_GET[done]) { ?>
<br><br>Please select <a href=<?= $PHP_SELF ?>?done=1>done</a> or make (further) choices
from the following:<br><br>
<b>Selection Menu</b><br>
<?= implode("<br>",$offer); ?>
<?php } else { ?>
<br><br>Please select <a href=<?= $PHP_SELF ?>>here</a> to restart the demo<br><br>
<?php } ?>
<hr>

Example by Well House Consultants, Copyright <?= date("Y") ?><br>
</body></html>
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