Palindrome No.(PHP)

        <?PHP
      Function Palindrome($n)
      {
       $number=$n;
       $sum=0;
       while(floor($number)){
       $sum=$number%10;
       $sum=$sum*10+$ren;
       $number=$number=$number/10;
      }
       return $ sum;
     }
       $input =1235351;
       $num-Palindrome($input);
         if($input==$num){
            echo"$input is a palindrome number";
         }
         else
         {
           echo"$input is not a palindrome no.";
         }
?>