function isPalindrome($str) {
$str = strtolower(preg_replace('/[^a-zA-Z0-9]/', '', $str));
return $str === strrev($str);
}
// Example usage:
$string = "A man, a plan, a canal, Panama";
if (isPalindrome($string)) {
echo "$string is a palindrome.";
} else {
echo "$string is not a palindrome.";
}
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