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<?php class B implements JsonSerializable { public function jsonSerialize() { return array( 'Recursion' => array( 'across' => array( 'multiple' => array('levels' => $this) ) ) ); } } var_dump(json_encode(new B(), JSON_PARTIAL_OUTPUT_ON_ERROR));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of B::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Ldd3X on line 4 string(53) "{"Recursion":{"across":{"multiple":{"levels":null}}}}"

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