title: Memory limit and very big XML file
body: <p>I need to parse a very big XML file, with a filesize of 750Mo !</p>
  
  <p>I have meomy limit at 512M</p>
  
  <pre><code>ini_set('memory_limit', '512M');
  </code></pre>
  
  <p>I have no problem to open file under 30Mo, but with 750Mo, I obtain a fatal error</p>
  
  <pre><code>Fatal error: Allowed memory size of 1677721600 bytes exhausted (tried to allocate 2988843769 bytes)
  </code></pre>
  
  <p>I do that to open files :</p>
  
  <pre><code>$fichier = file_get_contents($inputfileName);
  $xmlInput = simplexml_load_string(utf8_encode($fichier));
  </code></pre>
  
  <p>Have you an idea to open this file ?</p>