SWAT/session/STransaction.php5

<?php
class STransaction extends SObject {
    private $transId = null;
    private $previousTransId = null;
    private $transLog = array();

    public function getTransaction() {
        // Generate a new transaction response
        if ($this->transId != null)
            return ($this->transId);

        $date = time();
        $ip = $_SERVER['REMOTE_ADDR'];
        $rand = rand(0, 100000);
        $page = $_SERVER['REQUEST_URI'];
        $this->transId = MD5($date . $ip . $rand . $page);

        return ($this->transId);
    }

    public function setTransaction($a) {
        array_push($this->transLog, $this->previousTransId);
        $this->previousTransId = $a;
        $this->transId = null;
    }

    public function getValidTransaction($a) {
        $prevTrans = $this->getPreviousTransactionId();

        # if it was the previous transaction, return false quickly
        if ($a == $prevTrans) return (false);

        # if not, check through the entire history of transactions
        for ($i = 0; $i < count($this->transLog); $i++) {
            if ($a == $this->transLog[$i]) return (false);
        }
        return (true);
    }

    public function getTransactionId() {
        return ($this->transId);
    }

    public function getPreviousTransactionId() {
        return ($this->previousTransId);
    }

    public function __sleep() {
        return array_keys(get_object_vars($this));
    }

    public function __wakeup() {
        return array_keys(get_object_vars($this));
    }
}
?>

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