title: convert string to 2D array using php
body: <p>suppose I have a string like the follwing:</p>
  
  <pre><code>   01,03,02,15|05,04,06,10|07,09,08,11|12,14,13,16 
  </code></pre>
  
  <p>How to convert it to a 2D array like the follwing using php?:</p>
  
  <pre><code>   01 03 02 15
     05 04 06 10 
     07 09 08 11  
     12 14 13 16 
  </code></pre>
  
  <p>any help will be greatly appreciated, thanks!</p>