PHP Palindrome Number Program

by Online Tutorials Library July 22, 2022

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:

  <?php  function palindrome($n){  $number = $n;  $sum = 0;  while(floor($number)) {  $rem = $number % 10;  $sum = $sum * 10 + $rem;  $number = $number/10;  }  return $sum;  }  $input = 1235321;  $num = palindrome($input);  if($input==$num){  echo “$input is a Palindrome number”;  } else {  echo “$input is not a Palindrome”;  }  ?>  

Output:

PHP Palindrome number 1

Palindrome Number using Form in PHP

Example:

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

  <form method=”post”>  Enter a Number: <input type=”text” name=”num”/><br>  <button type=”submit”>Check</button>  </form>  <?php   if($_POST)  {  //get the value from form  $num = $_POST[‘num’];  //reversing the number  $reverse = strrev($num);    //checking if the number and reverse is equal  if($num == $reverse){  echo “The number $num is Palindrome”;  }else{  echo “The number $num is not a Palindrome”;  }  }        ?>  

Output:

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

PHP Palindrome number 2

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

PHP Palindrome number 3

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