Script to test icons and mimetype stings in Moodle 2.3

testicons.php

<?php

require_once('config.php');
require_once($CFG->libdir .'/filelib.php');

$PAGE->set_context(get_system_context());

$mimeicons = get_mimetypes_array();
?>
<style>
    table {border-collapse: collapse;}
    .row {}
    .icon90 {vertical-align: top;padding-top:5px;}
    .icon24 {vertical-align: top;padding-top:25px;}
    .extension {}
    .mimetype {}
    .badtype {color:#666;}
    .goodtype {}
    td {border-bottom: 1px solid #666; padding-left:2px;padding-right:2px;}
    tr.last td, td.last {border-bottom: 2px solid black;}
</style>
<?php
echo '<table>';
echo "<tr><th>big icon</th><th>small icon</th><th>extension</th><th>mimetype</th><th>readable mime type</th></tr>";
$mimebyicons = array();
foreach ($mimeicons as $filetype => $value) {
    $mimebyicons[$value['icon']][] = $filetype;
}
$globalcnt=0;
foreach ($mimebyicons as $icon => $mimes) {
    for ($i=0;$i<count($mimes);$i++) {
        $filetype = $mimes[$i];
        $value = $mimeicons[$filetype];
        $icon = mimeinfo('icon', '.'.$filetype);
        $icon90 = file_extension_icon('.'.$filetype, 90);
        $icon24 = file_extension_icon('.'.$filetype, 24);
        $class = "row";
        if (!$i) {$class.=" first";}
        if ($i==count($mimes)-1) {$class.=" last";}
        if ((++$globalcnt)%2) {$class.=" odd";} else {$class.=" even";}
        echo "<tr class=\"$class\">";
        if (!$i) {
            echo "<td class=\"icon90 last\" rowspan=\"".count($mimes)."\">".$OUTPUT->pix_icon($icon90,'')."</td>";
            echo "<td class=\"icon24 last\" rowspan=\"".count($mimes)."\">".$OUTPUT->pix_icon($icon24,'')."</td>";
        }
        echo "<td class=\"extension\">$filetype</td><td class=\"mimetype\">{$value['type']}</td>";
        $type = get_mimetype_description(array('filename'=>'.'.$filetype));
        if ($type !== $value['type']) {
            $class = "goodtype";
        } else {
            $class = "badtype";
        }
        echo "<td class=\"$class\">".$type."</td></tr>";
    }
}
echo '</table>';