For beginners above answer might be difficult, this is the easiest way to understand it:
Traits
trait SayWorld {
public function sayHello() {
echo 'World!';
}
}
so if you want to have sayHello function in other classes without re-creating the whole function you can use traits,
class MyClass{
use SayWorld;
}
$o = new MyClass();
$o->sayHello();
Cool right!
Not only functions you can use anything in the trait(function, variables, const...). Also, you can use multiple traits: use SayWorld, AnotherTraits;
Interface
interface SayWorld {
public function sayHello();
}
class MyClass implements SayWorld {
public function sayHello() {
echo 'World!';
}
}
So this is how interfaces differ from traits: You have to re-create everything in the interface in an implemented class. Interfaces don't have an implementation and interfaces can only have functions and constants, it cannot have variables.
I hope this helps!