title: Calling a PHP Function from a HTML <Select> option
body: <p>I have a <code>&lt;select&gt;</code> element with 3 options within it and also have 3 PHP functions. How can I set it so that when each option is pressed a different PHP function is called? By my understanding, the select options are client side and the functions are server side. Does this mean that AJAX is necessary? Is there a way to do this without AJAX?</p>
  
  <pre><code>&lt;select name="mySelect"&gt;
    &lt;option value="filter-oa" disabled="disabled" selected&gt;Filter by Open Access&lt;/option&gt;
    &lt;option value="full"&gt;Fully Open Access&lt;/option&gt;
    &lt;option value="offers"&gt;Offers Open Access&lt;/option&gt;
    &lt;option value="none"&gt;No Open Access&lt;/option&gt;
  &lt;/select&gt;  
  </code></pre>
  
  <p>My 3 functions are: <code>getProOA(), getProFullOA(), and getProNoOA()</code>
  Example: User selects the "Fully Open Access" option within the drop-down menu and the <code>getProFullOA()</code> function is called and lists the products on the page.</p>