insert multiple table rows via a php into mysql - php

Question

I am inserting multiple line values from a html table form in to sql but it's only inserting the last table form value in my database. I can't figure out where the problem is.
Can you help me out with this?
This is my PHP:
$result = mysql_query("SELECT * FROM ex_marks WHERE session='$session' and cl_name='$cl_name' and cl_section='$cl_section' and subject='$subj' and exam='$exam' and date='$date' and roll_no='$rollno' and obtainmarks='$marks'");
if (mysql_num_rows($result) == 0)
{
mysql_query("INSERT INTO ex_marks(mid, session, cl_name, cl_section, name, fname, status, date, exam, roll_no, subject, obtainmarks, maxmarks, passmarks)
VALUES('', '$session', '$cl_name', '$cl_section', '$name','$fname', '$attendance', '$date', '$exam', '$rollno', '$subj','$marks','$maxmarks','$passmarks')") or die(mysql_error());
echo "<script type='text/javascript'>alert('Submitted Successfully!')</script>";
}
else
{
echo "<script type='text/javascript'>alert('Already Exist!')</script>";
}
}
And this is the form where values are inserted:
<div id="page-wrapper">
<div class="container-fluid">
<div class="row">
<div class="col-lg-12">
<h1 class="page-header">ASSIGN MARKS</h1>
<div class="col-lg-6">
<div class="panel">
<form method="post">
<!--<div class="form-group">
<input type="text" size="15" name="date" id="name[]" class="tcal form-control" placeholder="EXAM DATE" required="required"/>
</div>-->
<div class="form-group">
<input class="form-control" type="text" size="17" name="maxmarks" placeholder="TOTAL MARKS" required="required"/>
</div>
<div class="form-group">
<input class="form-control" type="text" size="17" name="passmarks" placeholder="PASS MARKS" required="required"/>
</div>
<button name="btn_sub" type="submit" class="btn btn-info">SUBMIT</button>
</div>
</div>
<!-- /.col-lg-12 -->
</div>
</div>
<!-- /.row -->
<div class="row">
<div class="col-lg-12">
<div class="panel panel-default">
<div class="panel-heading">
Session :
<?php
$session=$_GET['session'];
echo $session;?>
Class :
<?php
$cl_name=$_GET['cl_name'];
echo $cl_name;?>
Section :
<?php
$cl_section=$_GET['cl_section'];
echo $cl_section;?>
Subject :
<?php
$subj = $_GET['subj'];
echo $subj;?>
Exam Date :
<?php
$date=$_GET['date'];
echo $date;?>
Exam :
<?php
$exam=$_GET['exam'];
echo $exam;?>
</div>
<!-- /.panel-heading -->
<div class="panel-body">
<div class="dataTable_wrapper">
<table class="table table-striped table-bordered table-hover" id="dataTables-example">
<thead>
<tr>
<th>NO.</th>
<th class="text-center">NAME</th>
<th class="text-center">ROLL NO</th>
<th class="text-center">FATHER NAME</th>
<th class="text-center">SCORED MARKS</th>
<th class="text-center">ATTENDANCE</th>
</tr>
</thead>
<tbody>
<?php
$key="";
if(isset($_POST['searchtxt']))
$key=$_POST['searchtxt'];
if($key !="")
$sql_sel1=mysql_query("SElECT * FROM ex_attendance WHERE session like '%$key%' and cl_name like '%$key%' and cl_section like '%$key%'");
else
$sql_sel1=mysql_query("select * from ex_attendance where session='$session' and cl_name='$cl_name' and cl_section='$cl_section' and exam='$exam' and date='$date' and subject='$subj'");
$i=0;
while($row1=mysql_fetch_array($sql_sel1))
{
$i++;
$color=($i%2==0)?"lightblue":"white";
?>
<tr class="odd gradeX">
<td><?php echo $i;?></td>
<td align="center"><input size="17" type="text" name="name" value="<?php echo $row1['f_name']." ".$row1['m_name']." ".$row1['l_name'];?>" readonly="readonly"/></td>
<td align="center"><input size="13" type="text" name="rollno" value="<?php echo $row1['roll_no']?>" readonly="readonly"/></td>
<td align="center"><input size="17" type="text" name="fname" value="<?php echo $row1['fname']?>" readonly="readonly"/></td>
<td align="center"><input size="17" type="text" name="marks" required="required"/></td>
<td align="center"><input size="17" type="text" name="attendance" id="name[]" value="<?php echo $row1['status'];?>" readonly="readonly"/></td>
</tr>
<?php }?>
</form>
</tbody>
</table>
</div>
</div>
<!-- /.table-responsive -->
</div>
<!-- /.panel-body -->
</div>
<!-- /.panel -->
</div>
<!-- /.col-lg-12 -->
</div>
</div>