title: php copy() not working with an specific url link
body: <p>I want to copy an image from an another server, but it doesn't work and i don't know why. Here is my code:</p>
  
  <pre><code>if(copy('http://demo.swyp.fr/mod_traffiq/thumb/LQ1009C/LQ143559C/LQ157553C-71x100.jpg', 'zzz.jpg')) {
      echo "Copy success!";
  }else{
      echo "Copy failed.";
  }
  </code></pre>
  
  <p>It always returns failed.</p>