PHP Palindrome Rearranging
function palindromeRearranging($inputString) {
    $val = array_count_values(str_split($inputString));
    $c = 0;
    foreach($val as $v) {
        if($v%2 != 0) {$c++;};
    }
    return $c <= 1;
}

This counts character frequency and checks whether the string has the right number of odd counts to form a palindrome.