将dropdownlist值从一个页面传递到另一个页面

Question

I want to do like in this website when a user selects the value from (to) and (from) dropdown list and also select departure and return from this page then he moves to the next page and dropdownlist in next page are automatically populated with the value selected by the user in first page. My question is how dropdownlist in second page are displayed?

<form id="form_1" action="page2.php" method="post">
    <fieldset>
        <div class="pad1">
            <h3>Find Your Trip</h3>
            <p>
                <label for="select">Trip Type</label>
                <select name="select4" id="select">
                    <option value="choose">Choose</option>
                    <option value="one way">One way</option>
                    <option value="round trip">Round Trip</option>
                </select>
            </p>
            <div class="row_select">
                <p>
                    From:
                    <select name="select">
                        <option value="" selected>:: Departure ::</option>
                        <option value="36">ABBOTTABAD</option>
                        <option value="6" >BAHAWALPUR</option>
                        <option value="18" >CHINIOT</option>
                        <option value="14" >DERA GHAZI KHAN</option>
                        <option value="16" >FAISALABAD</option>
                        <option value="34" >GUJRANWALA</option>
                        <option value="33" >GUJRAT</option>
                        <option value="53" >JHELUM</option>
                        <option value="13" >KARACHI</option>
                        <option value="5" >MULTAN</option>
                        <option value="35" >MURREE</option>
                        <option value="25" >PESHAWAR</option>
                        <option value="22" >RAWALPINDI</option>
                        <option value="22" >LAHORE</option>
                    </select>
                </p>
                <p>
                    To:    
                    <label></label>
                    <select name="select2">
                        <option value="" selected>:: Arrival ::</option>
                        <option value="36">ABBOTTABAD</option>
                        <option value="53" >JHELUM</option>
                        <option value="13" >KARACHI</option>
                        <option value="53" >MULTAN</option>
                        <option value="3" >MURREE</option>
                        <option value="5" >PESHAWAR</option>
                        <option value="2" >RAWALPINDI</option>
                        <option value="2" >LAHORE</option>
                    </select><br>
                </p>
            </div>
            <div class="row_select">
                <p>
                    Arrival:<br>
                    <input type="date" name="bday" max="1979-12-31"><br>

                     Destination:                
                </p>
                <p>
                    <input type="date" name="bday2" min="2000-01-02"><br>
                    <span class="cols">Adult:<br>
                        <select name="select3">
                            <option>&nbsp;</option>
                            <option>...</option>
                            <option>...</option>
                        </select>
                    </span><br><br>
                    <span class="cols pad_left1">
                        <a href="page2.php" class="button">BUY</a>                 
                    </span>
                </p>
            </div>
            <p>&nbsp;</p>
        </div>
    </fieldset> 
</form>

Answer 1

   <form id="form_1" action="#" method="post">
     <div class="pad1">
     <h3>Find Your Trip </h3>
     <p>
     <label for="select">Trip Type</label>
     <select name="select4" id="select">
     <?php echo $_POST["select4"]; ?>!<br>
     <option value="choose">Choose</option>
     <option value="one way">One way</option>
     <option value="round trip">Round Trip</option>
     </select>
     </p>
     <div class="row_select">
     <p>From:
     <select name="select">
     <?php echo $_POST["select"]; ?>!<br>
     <option value="" selected>:: Departure ::</option>
     <option value="36">ABBOTTABAD</option>
     <option value="6">BAHAWALPUR</option>
     <option value="6">BAHAWALPUR</option>
     <option value="18">CHINIOT</option>
     <option value="14">DERA GHAZI KHAN</option>
     <option value="16">FAISALABAD</option>
     <option value="34">GUJRANWALA</option>
     <option value="33">GUJRAT</option>
     <option value="53">JHELUM</option>
     <option value="13">KARACHI</option>
     <option value="5">MULTAN</option>
     <option value="35">MURREE</option>
     <option value="25">PESHAWAR</option>
     <option value="22">RAWALPINDI</option>
     <option value="22">LAHORE</option>
     </select>
     </p>
     <p> To:
     <label></label>
     <select name="select2">
 <?php echo $_POST["select2"];?>!<br>
     <option value="" selected>:: Arrival ::</option>
     <option value="36">ABBOTTABAD</option>
     <option value="53">JHELUM</option>
     <option value="13">KARACHI</option>
     <option value="53">MULTAN</option>
     <option value="3">MURREE</option>
     <option value="5">PESHAWAR</option>
     <option value="2">RAWALPINDI</option>
     <option value="2">LAHORE</option>
     </select>
     <br>
     </p>
     </div>
     <div class="row_select">
     <p>Arrival:<br>
     <input type="date" name="bday" max="1979-12-31">
     <?php echo $_POST["bday"];?>!<br>
     <br>
     Destination:                
     </p>
     <p>
     <input type="date" name="bday2" min="2000-01-02">
     <?php echo $_POST["bday2"];?>!<br>
     <br>
     <span class="cols">Adult:<br>
     <select name="select3">
     <option>&nbsp;</option>
     <option></option>
     <option></option>
     </select>
     </span><br>
     <br>
     <span class="cols pad_left1"><a href="page2.php" class="button">BUY</a>                 </span></p>
     </div>
     <p>&nbsp;</p>
     </div>
     </fieldset> 
     </form>