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function seo_url($string, $seperator='-') {
    $string = strtolower($string);
    $string = preg_replace("/[^a-z0-9_\s-]/", $seperator, $string);
    $string = preg_replace("/[\s-]+/", " ", $string);
    $string = preg_replace("/[\s_]/", $seperator, $string);
    return $string;
}