โค๊ดตัดเกรดที่เขียนกับ phpใครพอจะมีบ้างค่ะ คือใครพอจะมีโค๊ดตัดเกรดที่เขียนกับ phpใครพอจะมีบ้างค่ะ

<?
$name=$_POST["txt_name"];	//รับค่าชื่อ
$num=$_POST["txt_num"];	//รับค่าคะแนน
$score="";
if($num >=80) { $score= "A" ; }
	else if (($num>=70)&&($num<=79)) { $score= "B" ; }
	else if (($num>=60)&&($num<=69)) { $score= "C" ; }
	else if (($num>=50)&&($num<=59)) { $score= "D" ; }
	else  { $score= "F" ; }
?>

  <table width="390" border="1" align="center">
    <tr>
      <td colspan="2"><div align="center"><strong>ผลการคำนวณเกรด</strong></div></td>
    </tr>
    <tr>
      <td width="116"><strong>ชื่อนักศึกษา</strong></td>
      <td width="258"><?echo "$name";?>&nbsp;</td>
    </tr>
    <tr>
      <td><strong>คะแนน</strong></td>
      <td><?echo "$num";?>&nbsp;</td>
    </tr>
    <tr>
      <td><strong>เกรดที่ได้</strong></td>
      <td><?echo "$score";?>&nbsp;</td>
    </tr>
  </table>

insert($_POST['name'],$_POST['ฟิวด์คะแนน'],function($_POST['ฟิวด์คะแนน']),$POST['...'],...);

function($value){
...
}

function cut_Grade($score)
{
      if($score >=80) { $grade= "A" ; }
	else if (($score>=70)&&($score<=79)) { $grade= "B" ; }
	else if (($score>=60)&&($score<=69)) { $grade= "C" ; }
	else if (($score>=50)&&($score<=59)) { $grade= "D" ; }
	else  { $grade= "F" ; }
       return $grade;
}

<?php
	/* 80-100 =A
		70-79 =B
		60-69 =C
		50-59 =D
		0-49  =F */
	$score=75
	if($score >=80)
	  {$grade='A';}
	elseif($score >=70)
			{$grade='B';}
	elseif($score >=60)
			{$score='C';} 
	elseif($score >=50)
			{$score='D';} 
	elseif($score)
			{$score='C';}
else 
	{$score= 'F';} 
	echo "grade";

?>

<?php
$score = $_POST['score'];
if($score<50)
{
   $grade=0;
} 
else if($score>=50 && $score<59)
{
    $grade=1;
}
else if($score>=60 && $score<69)
{
    $grade=1;
}else if($score>=70 && $score<79)
{
   $grade=2;
}
else if($score>=80 && $score<89)
{
    $grade=3;
}
else if($score>=90 && $score<=100)
{
    $grade=4;
}
else
{
   $grade='error';
}
?>
<form id="form1" name="form1" method="post" action="grade3.php">
  <table width="100%" border="1">
    <tr>
      <td colspan="2">การตรวจสอบผมการเรียน</td>
    </tr>
    <tr>
      <td width="25%">คะแนน</td>
      <td width="75%"><label for="score"></label>
      <input type="text" name="score" id="score" /></td>
    </tr>
    <tr>
      <td>เกรดที่ได้</td>
      <td><?php echo $grade?></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td><input type="submit" name="sub" id="sub" value="คำนวณ" /></td>
    </tr>
  </table>
</form>