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:

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.