Palindrome Number

A palindrome number is a number which remains same when its digits are reversed.

For example, number 24142 is a palindrome number. On reversing it we?ll get the same number.

Logic:

• Take a number.
• Reverse the input number.
• Compare the two numbers.
• If equal, it means number is palindrome

Palindrome Number in PHP

Example:

8. Modules and PHP Abstract class | Build a CMS using OOP PHP CMS tutorial MVC [2020]

1. <?php  
2. function palindrome($n){  
3. $number = $n;  
4. $sum = 0;  
5. while(floor($number)) {  
6. $rem = $number % 10;  
7. $sum = $sum * 10 + $rem;  
8. $number = $number/10;  
9. }  
10. return $sum;  
11. }  
12. $input = 1235321;  
13. $num = palindrome($input);  
14. if($input==$num){  
15. echo "$input is a Palindrome number";  
16. } else {  
17. echo "$input is not a Palindrome";  
18. }  
19. ?>  

Output:

Palindrome Number using Form in PHP

Example:

We'll show the logic to check whether a number is palindrome or not.

1. <form method="post">        
2. Enter a Number: <input type="text" name="num"/><br>  
3. <button type="submit">Check</button>  
4. </form>  
5. <?php   
6.     if($_POST)  
7.     {  
8.         //get the value from form  
9.         $num = $_POST['num'];  
10.         //reversing the number  
11.         $reverse = strrev($num);  
12.           
13.         //checking if the number and reverse is equal  
14.         if($num == $reverse){  
15.             echo "The number $num is Palindrome";     
16.         }else{  
17.             echo "The number $num is not a Palindrome";   
18.         }  
19. }     
20.       ?>  

Output:

On entering the number 23432, we get the following output.

On entering the number 12345, we get the following output.