Insert Data Using PHP Mysqli

<form id="form1" name="form1" method="post" >
<table width="445" height="394" border="1" align="center">
  <tr>
    <td>Name</td>
    <td>
    
      <input type="text" name="name" />
    </td>
  </tr>
  <tr>
    <td>email</td>
   
    <td>
    <input type="email" name="email" />
    </td>
  </tr>
  <tr>
    <td>address</td>
    <td><textarea name="address"></textarea></td>
  </tr>
  <tr>
    <td>mobile no.</td>
    <td>
    <input type="text" name="mobile" />
    </td>
  </tr>


  <tr>
    <td><input type="submit" name="submit" value="submit" /></td>
    <td>
    <input type="button" name="cancel" value="cancle" />
    </td>
  </tr>

</table>

</form>

<?php
$con=mysqli_connect("localhost","root","root","example") or die(mysqli_error());

if(isset($_POST['submit']))
{
extract($_POST);

$q=mysqli_query($con,"insert into student_info(name,email,address,m_no) values ('$name','$email','$address','$mobile')") or die(mysqli_error($con));

if($q)
{
echo"<script>";
echo"alert('Record Added');";
echo"</script>";
}
else
{
echo"<script>";
echo"alert('Error While Inserting Record.....');";
echo"</script>";
}
}
?>