<?php
///////////////////////////////////////////////Registration by form//////////////////////////////
if(isset($_POST['add'])){
$sr_no=$_POST['sr_no'];
$roll_no=$_POST['roll_no'];
$o_tmark=$_POST['o_tmark'];
$o_vmark=$_POST['o_vmark'];
$yoga_tmark=$_POST['yoga_tmark'];
$yoga_vmark=$_POST['yoga_vmark'];
$s_tmark=$_POST['s_tmark'];
$s_vmark=$_POST['s_vmark'];
$i_tmark=$_POST['i_tmark'];
$i_vmark=$_POST['i_vmark'];
$o_totalmark=$o_tmark+$o_vmark;
$yoga_totalmark=$yoga_tmark+$yoga_vmark;
$s_totalmark=$s_tmark+$s_vmark;
$i_totalmark=$i_tmark+$i_vmark;
$date = date('m/d/y');
$sub1='Obstetrics';
$sub2='Nat.Yoga Treatment';
$sub3='Surgery';
$sub4='Iridology';
if($roll_no !="")
{
$rs=mysqli_query($con,"select * from 'bnysfinalyear' where roll_no='$roll_no'");
if (mysqli_num_rows($rs)>0)
{
echo "<script type='text/javascript'> alert('User Already Registered'); </script>";
exit;
}
else
{
mysqli_query($con,"INSERT into 'bnysfinalyear'('sr_no','roll_no','o_tmark','o_vmark','yoga_tmarks','yoga_vmarks','s_tamrk','s_vamrk','ir_tmark','ir_vmark','o_totalmark','yoga_totalmark','s_totalmark','ir_totalmark','date','sub1','sub2','sub3','sub4')
values('$sr_no','$roll_no','$o_tmark','$o_vmark','$yoga_tmark','$yoga_vmark','$s_tmark','$s_vmark','$i_tmark','$i_vmark','$o_totalmark','$yoga_totalmark','$s_totalmark','$i_totalmark','$date','$sub1','$sub2','$sub3','$sub4')")or die(mysqli_error($con));
$msg='<div class="alert alert-success">
<strong>Registration!</strong> Successfuly Submited.
</div>
';
}
}
}
?>
DATABASE
'id', 'sr_no', 'roll_no', 'student_name', 'enrol_no', 'o_tmark', 'o_vmark', 'ir_tmark', 'ir_vmark', 'yoga_tmarks', 'yoga_vmarks', 's_tamrk', 's_vamrk', 'o_totalmark', 'ir_totalmark', 'yoga_totalmark', 's_totalmark', 'date', 'sub1', 'sub2', 'sub3', 'sub4', 'status'
Удалить эту строку
if (mysqli_num_rows($rs)>0)
Попробуйте этот код
while($row=mysqli_fetch_assoc($rs)){
$roll_nos = $row['roll_no'] ;
if($roll_nos == $roll_no){
echo "<script type='text/javascript'> alert('User Already Registered'); </script>";
}
else
{
mysqli_query($con,"INSERT into 'bnysfinalyear'('sr_no','roll_no','o_tmark','o_vmark','yoga_tmarks','yoga_vmarks','s_tamrk','s_vamrk','ir_tmark','ir_vmark','o_totalmark','yoga_totalmark','s_totalmark','ir_totalmark','date','sub1','sub2','sub3','sub4')
values('$sr_no','$roll_no','$o_tmark','$o_vmark','$yoga_tmark','$yoga_vmark','$s_tmark','$s_vmark','$i_tmark','$i_vmark','$o_totalmark','$yoga_totalmark','$s_totalmark','$i_totalmark','$date','$sub1','$sub2','$sub3','$sub4')")or die(mysqli_error($con));
$msg='<div class="alert alert-success">
<strong>Registration!</strong> Successfuly Submited.
</div>
';
}
}
$_POST
на переменные. Вы просто увеличиваете использование памяти без причины