title: Difference between PHP and PHP5
body: <p>I want to study OOP-related PHP, mainly for mashups and some development. I started with PHP and MySQL.</p>
  
  <p>What's the main relation or difference between PHP and PHP5. Is there anything different like PHP is for web development and the other PHP is for software development?</p>
  
  <p>Please guide me with some books with PHP OOP examples and concepts...</p>