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  1. <?
  2. class Dummy{}
  3. class Test extends ArrayObject{
  4.         public function append(Dummy $value){
  5.                 parent::append($value);
  6.         }
  7. }
  8.  
  9. $d = new Dummy();
  10. $t = new Test();
  11. $t->append($d);
  12. var_dump($t);
  13. //$t->append('a'); // throws error as expected
  14.  
Success #stdin #stdout 0.02s 13064KB
comments (?)
stdin 
Standard input is empty
stdout 
object(Test)#2 (1) {
  [0]=>
  object(Dummy)#1 (0) {
  }
}
https://ideone.com/TRj1aP
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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