title: PHP - Trim doesn't work with white space?
body: <p>Today, i have very weird problem with trim function.
  Here is my code. =and result is 124.
  Trim function didn't work with this string ??!</p>
  
  <pre><code>$s = '                                                                                  ';
  $s = trim($s);
  echo strlen($s);exit();
  </code></pre>
  
  <p>Copy &amp; paste doesn't work with this code. 
  i don't know what white space is? but trim couldn't strip it :|</p>
  
  <p>you can test this code here:</p>
  
  <p>test:
  http:// 70.38.18.62/t.php</p>
  
  <p>You can copy white space and code over there:
  <a href="http://jsbin.com/ukunuq/1/edit" rel="nofollow">http://jsbin.com/ukunuq/1/edit</a></p>