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";
}
?>
On entering the number 23432, we get the following output.
Output
Palindrome Number using Form in PHP
We'll show the logic to check whether a number is palindrome or not.
Example:
<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";
}
}
?>
On entering the number 23432, we get the following output.
Output
On entering the number 12345, we get the following output.
Output
