求大神看看这个关于创建有关问题的代码

";
if (!$_POST["question_num"])
{
    echo "
create question
";
    echo "";
    echo "";
    echo "";
    echo "fuck";
}
else if (!$_POST["question_num"])
{
    echo "
create question
";
    echo "";
    echo "";
    echo "";
}
else
{
    $num=$_POST["question_num"];
    $f=$_POST["f"];
    $sql="insert into question(`f`,`t`,`content`)values";
    for ($i=0;$i<$num;$i++)
    {
        $content=$_POST["question"][$i];
        $t=$_POST["to"][$i];
        $sql=$sql."('".$f."','".$t."','".$content."')";
        if ($i<$num-1)
        $sql=$sql.",";
    }
    include 'config.php';
    $re=mysql_query($sql);
    if ($re)
    {
        echo "create question successful!";
        echo "
";
        echo "clickhereto add answer";
    }
}
echo "
";
?>