title: PHP - problem with mb_strlen
body: <p>I'd like to push a "value" into an "array" iff the string lenght is greater than 30. So I have done this PHP script :</p>
  
  <pre><code>if(!mb_strlen($string, 'utf-8')&lt;=30) array_push($array, "value");
  </code></pre>
  
  <p>But It push that value also if the string is lesser than 31... why?</p>