title: PHP login user logic
body: <p>I've scrapped all the tutorials that have never worked for one reason or another, and decided to roll out my own registration/login feature on my own, and to my surprise it actually works!</p>
  
  <p>But what I don't get is how the logic behind keeping somebody logged in works! Like, once they've logged in, do I just <code>$_POST</code> their data to whatever other page they visit and once they're on the new page <code>$_REQUEST</code> that post data from the URL and display a message like: "yeah, you're still logged in"?</p>
  
  <p>I'm a bit confused atm, so I hope this question doesn't confuse you too.</p>