title: How can I XOR these base64'd numbers?
body: <p>I have are 5 binary strings base64_encode()'ed</p>
  
  <pre class="lang-none prettyprint-override"><code>wAD4Af8B/gHuA/4BzgP1A/8P/h//f/xv+z30D9IDSAE=
  
  AAAgCPgf/B/4H/w1+B74Gfg/+B/8P/4f/D/8HwABAAA=
  
  AAAAAMB/wP/A/8B/4HvAf+B/+n/3P/Y//z/4n4CDgAE=
  
  AAAAXcB/wH/Af8B/wHfAP+B/6H/xf+7//r/4f0CngFY=
  
  AAiwifAP+B/4D/gf8B74D/gd8V/4H/gP8B/8vwABAAA=
  
  AAAAAAAA/QD/Af4B/iP+A/wD/A/+//7/+B+AAwAAAAA=
  </code></pre>
  
  <p>How can I XOR (<code>^</code>) each of them in pairs and count the 1bits in the result. Sounds like it should be simple but I have no idea how to work with binary in PHP.</p>