title: Jquery load() doesn't load php files
body: <p>The Head</p>
  
  <pre><code>&lt;script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"&gt;&lt;/script&gt;
  &lt;script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"&gt;  &lt;/script&gt;
  </code></pre>
  
  <p>The HTML</p>
  
  <pre><code>&lt;div id=info&gt;&lt;/div&gt;
  
  &lt;div id="tousarticles"&gt;
  
  &lt;div class="titre" id="listitem_4"&gt;
      &lt;p&gt;Blahblahblah&lt;/p&gt;
  &lt;/div&gt;
  
  &lt;div class="titre" id="listitem_59"&gt;
      &lt;p&gt;Blahblahblah&lt;/p&gt;
  &lt;/div&gt;
  
  &lt;div class="titre" id="listitem_58"&gt;
      &lt;p&gt;Blahblahblah&lt;/p&gt;
  &lt;/div&gt;
  
  &lt;div class="titre" id="listitem_71"&gt;
      &lt;p&gt;Blahblahblah&lt;/p&gt;
  &lt;/div&gt;
  
  &lt;/div&gt;
  </code></pre>
  
  <p>The Javascript</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  $(document).ready(function() {
      $("#tousarticles").sortable({
          opacity: 0.6,
          axis: 'y',
          update : function () {
              var order = $('#tousarticles').sortable('serialize');
              alert(order); // It alerts "listitem[]=59&amp;listitem[]=4&amp;listitem[]=58&amp;listitem[]=71"
              $("#info").load("test.php?"+order, function() {
                  alert( "Load was performed." ); // It alerts "Load was performed."
              });
          }
      });
  });
  &lt;/script&gt;
  </code></pre>
  
  <p>And the php</p>
  
  <pre><code>&lt;?php 
  $fp = fopen("./upload/file.txt","w+");
  // Normaly, the DB entry php script but, here, I put some stuff visible on a writable repertory on my server to know if it runs.
  ?&gt;
  </code></pre>
  
  <p>The sortable interface works well: I can change the place of the DIV "listitems" without problem. But the test.php doesn't load at all.</p>
  
  <p>Here is the process</p>
  
  <p>I change the first paragraph with the second and the first alert comes with the correct string (listitem[]=59&amp;listitem[]=4&amp;listitem[]=58&amp;listitem[]=71).I click "OK".</p>
  
  <p>So, as expected, the second alert comes with "Load was performed." I click "OK".</p>
  
  <p>However, the test.php script did'nt load.</p>
  
  <p>The alert "Load was performed." comes even if the file does'nt exist (testtt.php for example).</p>
  
  <p>Going to my server via ftp, there is no file /upload/file.txt.
  But the test.php runs well and creates an "upload/file.txt" when launched via url.</p>