fetch data by mysql

<?php

$con=mysqli_connect("localhost","root","","myschool");

if (isset($_POST['submit']))

{

$name=$_POST['n1'];

$fname=$_POST['f1'];

$gen=$_POST['g1'];

$class=$_POST['cla'];

$cource="";

$lat=$_POST['lat'];

$longt=$_POST['longt'];

if(!empty($_POST['c1'])){

foreach($_POST['c1'] as $selected){

$cource.= $selected.",";

}

}

$sql="INSERT INTO school(s_name,F_name,Class,Gender,Cource,Lat,Longt)VALUES('$name','$fname','$class','$gen','$cource','$lat','$longt')";

$qu=mysqli_query($con,$sql);

if($qu)

{

          echo "data inserted";

}

else

{

          echo mysqli_error($con);

}

}

?>