Traits — תכונות

trait world {
   public function sayWorld() {
     echo 'World!';
   }
 }
 
 class hello {
   use world; // <--- include the external trait code here
   public function say() {
     echo 'Hello ', $this->sayWorld();
   }
 }
 
 $o = new hello();
 $o->say(); // echos Hello World!

trait world {
   public function sayWorld() {
     echo 'World!';
   }
 }
 
 class hello {
   use world;
   public function say() {
     echo 'Hello ', $this->sayWorld();
   }
 }
 

class hi
{
  use world; // another class is using the same trait
  public function say()
  {
    echo 'Hi', $this->sayWorld();
  }
}
 
 $o = new hello();
 $o->say(); // echos Hello World!

 $o2 = new hi();
 $o2 -> say(); // echos Hi World!

trait tBeep  { public function beep()  { echo 'beep';   } }
trait tDrive { public function drive() { echo 'whoooom';} }
 
class LicencedDriver /*extends Driver*/
{
  use tBeep, tDrive;
}

class SuperCar /*extends Car*/
{
  use tBeep, tDrive;
}
 
$ld = new LicencedDriver();
$ld->beep(); // beep
$ld->drive(); // whoooom

$sc = new SuperCar();
$sc->beep(); // beep
$sc->drive(); // whooom

trait Hello {
   public function sayHello() {
     echo 'Hello ';
   }
 }
 
 trait World {
   public function sayWorld() {
     echo 'World!';
   }
 }
 
 trait HelloWorld {
   use Hello, World;
 }
 
 class MyHelloWorld {
   use HelloWorld;
 }
 
 $o = new MyHelloWorld();
 $o->sayHello();
 $o->sayWorld();
 // Results eventually in: Hello World!

trait tOne  
{
  public function beep() { echo '1beep'; }
  public function dooo() { echo '1dooo'; }
}
trait tTwo
{
  public function beep() { echo '2beep';}
  public function dooo() { echo '2dooo'; }
}

class car
{
  use tOne, tTwo
  {
    tOne::beep insteadof tTwo; // use tOne's beep
    tTwo::dooo insteadof tOne; // use tTwo's dooo

    // alias for the tTwo's beep, since the default beep() is tOne's
    tTwo::beep as twobeep;    
  }
}

$car = new car();
$car->beep();    // 1beep from tOne
$car->dooo();    // 2dooo from tTwo
$car->twobeep(); // 2beep with the alias

trait polite
{
  public function hi() { echo 'hi ', $this->name; }
  abstract public function bye();
}


class guest
{
  use polite;
  private $name = 'Alex';
  public function bye() { echo 'bye ', $this->name; }
}

$guest = new guest();
$guest->hi();  // hi Alex
$guest->bye(); // bye Alex