PHP Search Folder Function

<?php
function search_folder($query){
    $filname_splitter = '@';
    $results = 0;
    $results_name = '';
    $dir = '../candid/image/images/';
    if ($handle = opendir($dir)) {
        while (($file = readdir($handle)) !== false){
            if (!in_array($file, array('.', '..')) && !is_dir($dir.$file))
                if (strpos(basename(strtolower($file)), strtolower($query)) !== false) {
                  $results += 1;
                  $results_name .= basename($file) . $filname_splitter;
                }
        }
    }
    $return_string = '<p>Search: "' . $query . '" Returned ' . $results . ' Result(s)</p>';
    $filenames = explode($filname_splitter, $results_name);
    foreach($filenames as $fname) {
        $return_string .= '<p>' . $fname . '</p>';
    }
    return $return_string;
}
?>