title: check if an array have one or more empty values
body: <p>I have the array $var, and I'd like to return FALSE if one or more element in the array are empty (I mean, the string are "").</p>
  
  <p>I think that <code>array_filter()</code> is the better way, but I don't know how to filter it in this manner.</p>
  
  <p>How can I do it?</p>