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<?php class A { protected $a = 'a'; } class B implements \JsonSerialize { protected $a; function __construct(A $a) { $this->a = $a; } public function jsonSerialize() { return [ 'a' => $this->a ]; } } $b = new B(new A()); echo json_encode($b);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Interface "JsonSerialize" not found in /in/31Ft8:8 Stack trace: #0 {main} thrown in /in/31Ft8 on line 8
Process exited with code 255.

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