added sort to top of search page

site/public/search.php

 
   <div class="container">
 
+  <div class="row p-3">
+    <form action="search.php" method="POST">
+      <input type="hidden" name="search" value="<?php echo $_POST["search"]?>">
+      <input type="hidden" name="searchopt" value="<?php echo $_POST["searchopt"]?>">
+      sort by:
+      <select name="sort" id="sort" onchange="this.form.submit()">
+        <option value="relevance" <?php if($_POST["sort"] == 'relevance') echo "selected"; ?>>relevance</option>
+        <option value="year" <?php if($_POST["sort"] == 'year') echo "selected"; ?>>year</option>
+      </select>
+      <noscript>
+        <input type="submit" class="btn btn-default" value="Set" />
+      </noscript>
+    </form>
+  </div>
+  <hr>
+
 <?php
 
   $search_results = solr_search($_POST["search"], $_POST["searchopt"], $_POST["sort"]);