PHP Program to print reverse of a number

Php Program to print reverse of a number of a number

<?php
if(isset($_POST['submit']))
{
         $rev=0;
         $num=$_POST['num'];
          while($num>=1)
                {
                  $re=$num%10;
                  $rev=$rev*10+$re;
                  $num=$num/10;
                 }
                   echo "Reverse number of is " .$rev;
}



?>
<!DOCTYPE html>
 <html>
 <head>
 <title>Reverse of a number</title>
 </head>
 <body>
 <form name="reversenumber" action="" method="post">
 Number :<input type="text" name="num" value="" required=""><br>
 <input type="submit" value="Submit" name="submit">
 </form>
 </body>
 </html>