title: Best way to generate 6char UP/down string? PHP
body: <p>I know this question is incredibly common, but I'm asking the following (Google yields no results, and the other question which was similar to mine had incorrect source :s):</p>
  
  <p>What would be the best way to get a random 6 character different cased alphabet string eg 'aWGuPk'/'pZyTFu' or something of the sort (in PHP)? By 'best', the function with the shortest amount of code and most the most efficient?</p>
  
  <p>Sorry if this might be a duplicate of something I can't find on SO.</p>
  
  <p>Thanks,
  Karan</p>