title: Using null key in html form array
body: <p>In an html form, it is possible to send data as an array.  </p>
  
  <pre><code>&lt;!-- This is an associative array --&gt;
  &lt;input name="table[key1]"&gt;
  &lt;input name="table[key2]"&gt;
  
  &lt;!-- This is an index-based array --&gt;
  &lt;input name="table[]"&gt;
  &lt;input name="table[]"&gt;
  </code></pre>
  
  <p>Is it possible to store a value into an associative array, using an empty string as a key?<br>
  So that php could access the data with <code>$_POST["table"][null]</code></p>