PHP strtoascii

function strtoascii($str) {
    // Tableau des corespondance
    $str_ascii = array(
        'A'     => 'ÀÁÂÃÄÅĀĂǍẠẢẤẦẨẪẬẮẰẲẴẶǺĄ',
        'a'     => 'àáâãäåāăǎạảấầẩẫậắằẳẵặǻą',
        'C'     => 'ÇĆĈĊČ',
        'c'     => 'çćĉċč',
        'D'     => 'ÐĎĐ',
        'd'     => 'ďđ',
        'E'     => 'ÈÉÊËĒĔĖĘĚẸẺẼẾỀỂỄỆ',
        'e'     => 'èéêëēĕėęěẹẻẽếềểễệ',
        'G'     => 'ĜĞĠĢ',
        'g'     => 'ĝğġģ',
        'H'     => 'ĤĦ',
        'h'     => 'ĥħ',
        'I'     => 'ÌÍÎÏĨĪĬĮİǏỈỊ',
        'J'     => 'Ĵ',
        'j'     => 'ĵ',
        'K'     => 'Ķ',
        'k'     => 'ķ',
        'L'     => 'ĹĻĽĿŁ',
        'l'     => 'ĺļľŀł',
        'N'     => 'ÑŃŅŇ',
        'n'     => 'ñńņňʼn',
        'O'     => 'ÒÓÔÕÖØŌŎŐƠǑǾỌỎỐỒỔỖỘỚỜỞỠỢ',
        'o'     => 'òóôõöøōŏőơǒǿọỏốồổỗộớờởỡợð',
        'R'     => 'ŔŖŘ',
        'r'     => 'ŕŗř',
        'S'     => 'ŚŜŞŠ',
        's'     => 'śŝşš',
        'T'     => 'ŢŤŦ',
        't'     => 'ţťŧ',
        'U'     => 'ÙÚÛÜŨŪŬŮŰŲƯǓǕǗǙǛỤỦỨỪỬỮỰ',
        'u'     => 'ùúûüũūŭůűųưǔǖǘǚǜụủứừửữự',
        'W'     => 'ŴẀẂẄ',
        'w'     => 'ŵẁẃẅ',
        'Y'     => 'ÝŶŸỲỸỶỴ',
        'y'     => 'ýÿŷỹỵỷỳ',
        'Z'     => 'ŹŻŽ',
        'z'     => 'źżž',
        // Ligatures
        'AE'        => 'Æ',
        'ae'        => 'æ',
        'OE'        => 'Œ',
        'oe'        => 'œ'
    );

    // Convertion
    foreach ($str_ascii as $k => $v) {
        $str = mb_ereg_replace('['.$v.']', $k, $str);
    }

    return $str;
}