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<?php $json = "\xB1\x31"; try { var_dump(json_decode($json)); } catch(\Exception $e) { echo $e->getMessage(); } echo json_last_error_msg(); echo json_last_error();
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
NULL Malformed UTF-8 characters, possibly incorrectly encoded5

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