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<?php $str = "inte json"; $test = json_decode($str, true); var_dump($test); if($test === null) { var_dump(json_last_error_msg()); }
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.2.7
NULL string(12) "Syntax error"