Question

How to check if a number is palindrome in PHP

Answer 1

function isPalindrome($num) {
    $reverse = 0;
    $savednum = $num;
      
    while ($num > 0) {
        $reverse = $reverse * 10 + ($num % 10);
        $num = round($num / 10);
    }
      
    return $savednum == $reverse;
}

$n = 12321; 

echo (isPalindrome($n) ? "Yes" : "No");
  
   
   
/*
run:
   
Yes
   
*/

 

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Answer 2

function isPalindrome($n) {
    return $n == strrev($n);
}

$n = 12321; 

echo (isPalindrome($n) ? "Yes" : "No");
  
   
   
/*
run:
   
Yes
   
*/

 

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