title: increase by one a variable every time you push a button (PHP)
body: <p>I'd like that the variable <code>$order</code> is increase by 1 every time I push the submit button. </p>
  
  <p>(The name of the page is study.php so every time I push the button the page is refreshed):</p>
  
  <pre><code> &lt;?php 
   $order = $_GET['number']; 
  
   echo "&lt;form action='study.php' method='GET'&gt;
     &lt;input type='hidden' name='number' value='$order++' /&gt;
     &lt;input class='big_b' type='submit'  value='next' /&gt; 
   &lt;/form&gt;";
  
   echo "$order";
   ?&gt;
  </code></pre>
  
  <p>The first time 1 push the button $order is 1, the second 2, the third is 3 ... etc</p>
  
  <p>Thanks for your help!   </p>
  
  <p>EDIT: SOLVED</p>
  
  <pre><code> &lt;?php 
   session_start();
   if(empty($_SESSION['count'])) $_SESSION['count'] = 0;
   $order =  $_SESSION['count']+1;
   $_SESSION['count'] =  $order; 
  
   echo "&lt;form action='study.php' method='GET'&gt;
          &lt;input class='big_b' type='submit'  value='next' /&gt; 
      &lt;/form&gt;";
  
   echo "$order";
   ?&gt;
  </code></pre>