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run code in 200+ php & hhvm versions
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<?php $array = json_decode("govno", true); if (is_null($array)) { var_dump(json_last_error_msg()); }
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
string(12) "Syntax error"