Building WML Sites - Page 3

by: Andres Baravalle

February 21, 2001

Writing PHP/WML code

Now we write our first PHP/WML page which we call index.wml




<?php



Header("Content-type: text/vnd.wap.wml");

Header("Cache-Control: no-cache, must-revalidate");

Header("Pragma: no-cache");

echo ("<?xml version='1.0'?>");

?> 

<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"

    "http://www.wapforum.org/DTD/wml_1.1.xml" > 

<wml> 

<card id="card1" title="UNITO/Database"> 

<p> You can search for professors' consulting hours

  or for examinations timetables.

  <select name="choice" value="1" title="Research"> 

    <option value="exams_data">Examinations timetables</option> 

    <option value="consulting_data">Consulting hours</option> 

  </select> 

  <do type="text" label="Go"> 

  <go method="get" href="index2.wml#card2"> <postfield name="choice" value="$(choice)" /> </go> 

  </do> 

</p> 

</card> 

</wml>

The first line tells the browser accessing the page what kind of MIME type are sent. Without the header command, the browser could not understand what kind of content is coming. Moreover, with this line you are not forced to set a particular extension for your files. This is very useful if you plan to write multimodal pages, with a script that checks the device or its capabilities and returns WML or HTML according to the type of browser.

Check whether PHP is installed with short tags enabled. If yes, every time you write a declaration like

<?xml
  version='1.0'?>,

embed it into PHP code to avoid confusion.

The rest of the code of this page simply lets you search for examinations timetables or consulting hours. The choice is recorded into variable $choice.

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