I added that because `null` is also a valid JSON. And PHP `json_decode` simply return the string into `null` if it is invalid or broken.
• Values true, false and null are returned as TRUE, FALSE and NULL respectively.
• NULL is returned if the JSON cannot be decoded or if the encoded data is deeper than the recursion limit.
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• Values true, false and null are returned as TRUE, FALSE and NULL respectively.
• NULL is returned if the JSON cannot be decoded or if the encoded data is deeper than the recursion limit.
http://php.net/manual/en/function.json-decode.php#refsect1-function.json-decode-returnvalues
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