URL parsing and sessions in Reservation system

[Burhan_1]

I am creating a flight/hotel reservation system like farecompare.com Farecompare parse values to other sites and create sessions other sites too. Anyone tell me how they create sesssions in it. I can parse url but i am not able to create sessions.

public function flight($depart, $return, $from, $to, $type, $class,
                       $adults, $seniors, $children) {

    $dep = explode("/", $depart);
    $ret = explode("/", $return);

    if ($type == 'RoundTrip') {
        $expurl = 'http://www.expedia.co.in/Flights-Search?trip=' .
                  strtolower($type) . '&leg1=from%3A' . $from .
                  '%29%2Cto%3A' . $to .
                  '%29%2Cdeparture%3A' . $dep[1] .
                  '/'.$dep[0].'/'.$dep[2].
                  'TANYT&leg2=from%3A' . $to .
                  '%29%2Cto%3A' . $from .
                  '%29%2Cdeparture%3A' .
                  $ret[1].'/'.$ret[0].'/'.$ret[2] .
                  'TANYT&passengers=children%3A' . $children .
                  '%2Cadults%3A' . $adults .
                  '%2Cseniors%3A' . $seniors .
                  '%2Cinfantinlap%3AY&options=cabinclass%3Aeconomy'. 
                  '%2Cnopenalty%3AN%2Csortby%3Aprice&mode=search';

        echo '<a href = "' . $expurl . '" target = "_blank">Expedia</a>';
    } else {
        $type = 'oneway';

        $expurl = 'http://www.expedia.co.in/Flights-Search?trip='.
                  strtolower($type) . '&leg1=from%3A' . $from .
                  '%29%2Cto%3A' . $to . '%29%2Cdeparture%3A' .
                  $dep[1].'/'.$dep[0].'/'.$dep[2] .
                  'TANYT&passengers=children%3A' . $children .
                  '%2Cadults%3A' . $adults .
                  '%2Cseniors%3A' . $seniors .
                  '%2Cinfantinlap%3AY&options=cabinclass%3Aeconomy'. 
                  '%2Cnopenalty%3AN%2Csortby%3Aprice&mode=search';
        echo '<a href = "' . $expurl . '" target = "_blank">Expedia</a>';
    }
}

I worked on Expedia by parsing url to get data but there are other sites like cheapoait, travelocity etc which uses sessions. How to create sessions?

[broj1]

You can create sessions on your server only, not on other servers. To create a session put the session_start() command on the beginning of your script. Then assign values to the $_SESSION array. On each script that contains a session_start command you can read and change these values. The values can be of most php types (integer, float, string, array...).