UpstatePHP 101: Object Mayhem

Transcript

1. UpstatePHP 101
2. Object Mayhem
3. Andrew Lechowicz
4. Programming Languages are Tools • PHP • Erlang • C/C++ • Java • JavaScript • Chicken • Ruby
5. And Many Many More
6. Not Every Language has Every Feature • PHP had some basic OOP features in 4.0 • 5.0 has a full object model
7. "If all you have is a hammer, everything looks like a nail." — Proverb
8. Blueprints & Houses Classes & Objects
9. Classes • Classes -> Blueprints • Contain all the informa5on needed to build a house • Can't live in a blueprint
10. Objects • Objects -> Houses • Instan2ated Classes
11. A Basic Class class ClassName { } • Begin with class • Followed by the name of the class ClassName • Curly braces surround the defini:on {...}
12. Proper&es & Methods class ClassName { public $var = 'a default value'; // method declaration public function displayVar() { echo $this->var; } } • Constants -> Constants • Variables -> Proper3es • Func3ons -> Methods
13. It's All About Context
14. What is $this? • $this is a reference to the calling object
15. New Objects! <?php $instance = new SimpleClass(); // This can also be done with a variable: $className = 'SimpleClass'; $instance = new $className(); // new SimpleClass()
16. Let's Code