Online PHP editor | rfc for usehJ

@ 2017-07-07T03:04:04Z

<?php

/**
* An example of duck typing in PHP
*/

interface CanFly {
  public function fly();
}

interface CanSwim {
  public function swim();
}

class Bird {
  public function info() {
    echo "I am a {$this->name}\n";
    echo "I am an bird\n";
  }
}

/**
* some implementations of birds
*/
class Dove extends Bird implements CanFly {
  var $name = "Dove";
  public function fly() {
    echo "I fly\n";
  } 
}

class Penguin extends Bird implements CanSwim {
  var $name = "Penguin";
  public function swim() {
    echo "I swim\n";
  } 
}

class Duck extends Bird implements CanFly, CanSwim {
  var $name = "Duck";
  public function fly() {
    echo "I fly\n";
  }
  public function swim() {
    echo "I swim\n";
  }
}

/**
* a simple function to describe a bird
*/
function describe($bird) {
  if ($bird instanceof Bird) {
    $bird->info();
    if ($bird instanceof CanFly) {
      $bird->fly();
    }
    if ($bird instanceof CanSwim) {
      $bird->swim();
    }
  } else {
    die("This is not a bird. I cannot describe it.");
  }
}

echo describe("Kaczka");

Output for git.master, git.master_jit, rfc.property-hooks: This is not a bird. I cannot describe it.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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