List all hosts in the date subdirectories of a directory.

list_hosts.php

<form>
<select name="hostname">
<option value="">- Select Host -</option>
<?php
$collector_dir = '/var/tmp/days';
$hosts = array_unique(explode("\n", shell_exec("/bin/ls $collector_dir/*")));

foreach ($hosts as $host) {

    if ( strstr($host,"/") ) {

        # We don't want the directories

    } elseif ( $host == "" ) {

        # We don't want blank lines

    } else {

        echo "<option value='$host'>$host</option>";

    }

}
?>
</select>
</form>

Given a directory with a top level sub directory for each day, and a directory (or file) for each host in each day subdirectory, list ALL hosts from all day directories.

e.g.:

/var/tmp/days/
/var/tmp/days/20120515/
/var/tmp/days/20120515/host1
/var/tmp/days/20120515/host2
/var/tmp/days/20120516/
/var/tmp/days/20120516/host1
/var/tmp/days/20120516/host3

This will generate a select list with: host1 host2 host3