title: How to compare two arrays and remove matching elements from one for the next loop?
body: <p>How else might you compare two arrays ($A and $B )and reduce matching elements out of the first to prep for the next loop over the array $A?</p>
  
  <pre><code>$A = array(1,2,3,4,5,6,7,8);
  $B = array(1,2,3,4);
  
  $C = array_intersect($A,$B);  //equals (1,2,3,4)
  $A = array_diff($A,$B);       //equals (5,6,7,8)
  </code></pre>
  
  <p>Is this the simplest way or is there a way to use another function that I haven't thought of?  My goal is to have an array that I can loop over, pulling out groups of related content (I have defined those relationships elsewhere) until the array returns false.</p>