function buildPost($post, $res) {
   $post = preg_replace("#\[big\](.*?)\[/big\]#","<b>\\1</b>",$post);
    $post = preg_replace("#\[s\](.*?)\[/s\]#","<strike>\\1</strike>",$post);
   $post = preg_replace("#\[i\](.*?)\[/i\]#","<i>\\1</i>",$post);
    $post = preg_replace("#\[u\](.*?)\[/u\]#","<span style=\"border-bottom: 1px solid\">\\1</span>",$post);
    $post = preg_replace("#\[sp\](.*?)\[/sp\]#","<span class=\"spoiler\">\\1</span>",$post); // Это спойлер.