求大神看看这个关于创建有关问题的代码

<?phperror_reporting(E_ALL & ~ E_NOTICE);echo "<center>";if (!$_POST["question_num"]){    echo "<h2>create question</h2>";    echo "<table border=1>";    echo "<form method=post action=".$_SERVER["PHP_SELF"].">";    echo "<tr>";    echo "<td>create those questions is belong to</td>";    echo "<td>";    echo "<select size=1 name=f>";    include 'config.php';    $sql="select `id`,`content` from question where f=0";    $result=mysql_query($sql);    while ($row=mysql_fetch_array($result))    {        echo "<option value=".$row["id"];        echo ">".$row[content];        echo "</option>";    }    echo "</select>";    echo "</td>";    echo "</tr>";    echo "<tr>";    echo "<td>how many question will you want to create</td>";    echo "<td><input type=text name=question_num size=5></td>";    echo "</tr>";    echo "</tr>";    echo "<tr>";    echo "<td colspan=2><center><input type=submit value=next></center></td>";    echo "</tr>";    echo "</form>";    echo "</table>";    echo "fuck";}else if (!$_POST["question_num"]){    echo "<h2>create question</h2>";    echo "<table border=1>";    echo "<form method=post action=".$_SERVER["PHP_SELF"].">";    $num=$_POST["question_num"];    echo "<input type=hidden name=question_num value=".$num.">";    echo "<input type=hidden name=f value=".$_POST["f"].">";    echo "<tr>";    echo "<td>content</td>";    echo "<td>result</td>";    echo "</tr>";    for ($i=0;$i<$num;$i++)    {        echo "<tr>";        echo "<td>question".($i+1).":<input type=text name=question[] size=40></td>";        echo "<td>";        echo "<select size=1 name=to[]>";        echo "<option value=0>no<option>";        echo "<option value=1>yes<option>";        echo "</select>";        echo "</td>";        echo "</tr>";    }    echo "<tr>";    echo "<td><center><input type=submit value=submit></center></td>";    echo "</tr>";    echo "</form>";    echo "</table>";}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 "<p>";        echo "click<a href=add_answer.php>here</a>to add answer";    }}echo "<center>";?>