title: Php array modulo every second value
body: <p>I have a question. I have this array of the alphabet.
  And every even letter needs to be !$letter, so it needs to echo out !b, !d, !f</p>
  
  <p>I'm unsure how to do this. I've been told to use the modulo, % for this.</p>
  
  <p>But reading a lot about it on the internet and things haven't gotten any clearer for me.</p>
  
  <p>I appreciate anyone that can help me on this matter!
  Thanks in advance!</p>