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<?php var_dump(class_exists("TestClass")); //false class TestClass implements JsonSerializable { function __construct() { var_dump(__METHOD__); } public function jsonSerialize() { return null; } } var_dump(class_exists("TestClass")); //true
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) Deprecated: Return type of TestClass::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/gcfMs on line 9 bool(true)

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