How to check if the given string is palindrome? [closed]
PHP sample: $string = “A man, a plan, a canal, Panama”; function is_palindrome($string) { $a = strtolower(preg_replace(“/[^A-Za-z0-9]/”,””,$string)); return $a==strrev($a); } Removes any non-alphanumeric characters (spaces, commas, exclamation points, etc.) to allow for full sentences as above, as well as simple words.