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  1. <?php
  2.  
  3. interface A {
  4.     public function hello();
  5. }
  6.  
  7. abstract class B implements A {
  8.     public function __construct() {
  9.         if (method_exists($this, "hello"))
  10.         {
  11.             $this->hello();
  12.         }
  13.     }
  14. }
  15.  
  16.  
  17. class C extends B {
  18.     public function __contruct() {
  19.         parent::__construct();
  20.     }
  21.  
  22.     public function hello() {
  23.         echo "Hello world!";
  24.     }
  25. }
  26.  
  27. $B = new C();
Success #stdin #stdout 0.02s 24488KB
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Hello world!
https://ideone.com/HiIw6E
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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