title: auto increment with a string of numbers and letters
body: <p>Right now im using auto increment to identify resources in my website.</p>
  
  <p>The problem is i dont want the users to know how many resources there are.</p>
  
  <p>How could i instead use some kind of structured "random" combination of letters and numbers (say 6 digits) that i could use instead of (or in addition to) the auto incrementing primary key numbers.</p>
  
  <p>Basically i want the users to see</p>
  
  <pre><code>website.com/page.php?4jnd32
  </code></pre>
  
  <p>instead of</p>
  
  <pre><code>website.com/page.php?13
  </code></pre>
  
  <p>I dont even know what this practice is called which hampers my ability to search for an answer</p>