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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 */
function isPalindrome($n) { return $n == strrev($n); } $n = 12321; echo (isPalindrome($n) ? "Yes" : "No"); /* run: Yes */