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Check Palindrome: Write a PHP function to check if a given string is a palindrome or not.

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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