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<?php class Foo implements JsonSerializable { private $abc; private $xyu; public function setAbc($abc) { $this->abc = $abc; } public function jsonSerialize() { return [$this->abc]; } } $foo = new Foo(); $foo->setAbc('qwerty'); echo json_serialize($foo);
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of Foo::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/QZQLa on line 14 Fatal error: Uncaught Error: Call to undefined function json_serialize() in /in/QZQLa:23 Stack trace: #0 {main} thrown in /in/QZQLa on line 23
Process exited with code 255.

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