title: PHP 7 vs PHP 5 — changes in functions
body: <p>I'm currently building a website for my university assignment using local server XAMPP running PHP 7.1.1 but then I just found out that the university server is running an older PHP server version (I believe PHP 5.x) and all my PHP functions won't work at all.</p>
  
  <p>So I wonder: if I want to make it work with the university server, do I just need to change syntax to match PHP 5.x?  Because now I have no idea what are the differences between PHP 7.x and 5.x.</p>
  
  <p>Can anyone clarify this for me?</p>