title: fast way to find find min/max/avg value in file
body: <p>I have a file in the format</p>
  
  <pre><code>1    52
  2    456
  3    4516
  5    4545
  6     41
  </code></pre>
  
  <p>what would be the fastest way to read in the file and get the min/max/avg value in the second column in PHP?</p>