Calculate GPA without F's

<link href='http://fonts.googleapis.com/css?family=Open+Sans:300,400,600,700,800' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Orbitron' rel='stylesheet' type='text/css'>
<style type="text/css">
html, body{
       height: 100%;
       text-decoration:  none;
       font-family: 'Open Sans', sans-serif;
       background-color: #000000;
}

    textarea,h1{
       resize:none;
       color: #4099FF ;
       border: 1px solid #3B5998;

     font-family: 'Orbitron', sans-serif;
}

h3{
  color: #33CCFF;
}
input {
        color: ##33CCFF;
        border:1px dotted #33CCFF;
        width: 20%;
        font-family: 'Orbitron'; color:red;
}

h4{
color:red;
}

</style>


<center>
<h1> Calculate GPA without F's </h1>
<form action="" method="POST">
  </br>
  <textarea name="wholecode" rows="26" cols="130" placeholder="Copy Source Code Of Your IULMS Transcript page : http://iulms.iunc.edu.pk/iulms/sic/iu_transcript.php Here ">
</textarea>
</br></br>
  <input type="submit" name="GO">
</form>

<?php

function getGPA($score_arr) {
     $count = count($score_arr);
     $sum = array_sum($score_arr);

     $gpa = $sum / $count;

     return $gpa;

}

if (isset($_POST['GO'])) {

$no = $_POST['wholecode'];


// <td style="width: 70%;"></td>
 //echo $no;
 $a = array();

preg_match_all('/<td class=\'center\'>(.*?)<\/td>/s',$no,$matches);

for ($i=2; $i <count($matches[1]) ; $i+=3) {

if(!($matches[1][$i] == 0)){
  array_push($a,$matches[1][$i]);
}

}

echo "<h3> Your CGPA IS : ".getGPA($a)."</h3>";

}

?>

<h4>Created By Mohammad.Ali.Mian https://www.facebook.com/ali.mian.969 </h4>