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  1. <?php
  2. abstract class A
  3. {
  4.     public function __construct() {}
  5.  
  6.     abstract protected function listOfValues();
  7.  
  8.     public function sum() {
  9.         return array_sum($this->listOfValues());
  10.     }
  11. }
  12.  
  13. class new_B extends A {
  14.     public $one = 1;
  15.     public $two = 2;
  16.     public $three = 3;
  17.     public $four = 4;
  18.  
  19.     public function __construct() {
  20.         parent::__construct();
  21.     }
  22.  
  23.     protected function listOfValues() {
  24.         return array(
  25.             $this->one,
  26.             $this->two,
  27.             $this->three,
  28.             $this->four
  29.         );
  30.     }
  31. }
  32. class new_C extends A {
  33.     public $one = 1;
  34.     public $two = 2;
  35.  
  36.     public function __construct() {
  37.         parent::__construct();
  38.     }
  39.     protected function listOfValues() {
  40.         return array(
  41.             $this->one,
  42.             $this->two
  43.         );
  44.     }
  45. }
  46.  
  47. $b = new new_B();
  48. echo $b->sum();
  49. echo "\n";
  50. $c = new new_C();
  51. echo $c->sum();
Success #stdin #stdout 0.02s 52472KB
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https://ideone.com/b3Eccn
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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