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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"JsonSerializable throws warnings in newer PHP","articleBody":"I'm using PHP 8.x and the lack of a return type :mixed on the various library JsonSerialize functions throws out warnings all over the place when using the lib in newer php.\r\n\r\nThere are a couple of fixes. For newer php, the preferred method is to add the :mixed return type on any definitions of JsonSerialize so they are compatible with the interface.\r\n\r\n```\r\n    // Json Serialize Code\r\n    public function jsonSerialize(): mixed { /* code */ }\r\n\r\n```\r\n\r\nBut you can also add a comment above the function that older version of php will ignore and newer ones will suppress the warning.\r\n\r\ne.g.:\r\n\r\n```\r\n    // Json Serialize Code\r\n    #[\\ReturnTypeWillChange]\r\n    public function jsonSerialize() { /* code */ }\r\n\r\n```\r\n\r\nSee [ReturnTypeWillChange](https://php.watch/versions/8.1/ReturnTypeWillChange)","author":{"url":"https://github.com/scottw-finao","@type":"Person","name":"scottw-finao"},"datePublished":"2024-03-12T19:18:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/180/sample-code-php/issues/180"}