Accents, épisode 2

<?php
    private function friendly_filename($str) {
        // everything to lower and no spaces begin or end
        $str = strtolower(trim($str));

        //replace accent characters, depends your language is needed
        $str=$this->replace_accents($str);

        // decode html maybe needed if there's html I normally don't use this
        //$str = html_entity_decode($str,ENT_QUOTES,'UTF8');

        $str = escapeshellarg($str);

        // adding - for spaces and union characters
        $find = array(' ', '&', '\r\n', '\n', '+',',');
        $str = str_replace ($find, '_', $str);

        //delete and replace rest of special chars
        $find = array('/[^a-z0-9\-\.<>]/', '/[\-]+/', '/<[^>]*>/');
        $repl = array('', '-', '');
        $str = preg_replace ($find, $repl, $str);

        //return the friendly str
        return $str;
    }