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<?php $brokenJson = '[{"test":"aあb"}]'; $res = json_decode($brokenJson, true); if (json_last_error() != JSON_ERROR_NONE) { throw new Exception(json_last_error_msg(), json_last_error()); } var_dump($res);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(1) { [0]=> array(1) { ["test"]=> string(5) "aあb" } }

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