Simple bbcode

function bbasic($str){
    $str = preg_replace('/\[b\](.+?)\[\/b\]/ims','<span class="bold">$1</span>',$str);
    $str = preg_replace('/\[i\](.+?)\[\/i\]/ims','<span class="italic">$1</span>',$str);
    $str = preg_replace('/\[type\](.+?)\[\/type\]/ims','<span class="type">$1</span>',$str);
    return $str;
}