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<?php $names = preg_grep('/^JSON_ERROR/', array_keys(get_defined_constants())); $errors = array_combine(array_map("constant", $names), $names); var_dump(json_decode('{"":123}'), $errors[json_last_error()]); var_dump(json_decode(""), $errors[json_last_error()]);
Output for 7.1.0 - 7.2.6
object(stdClass)#1 (1) { [""]=> int(123) } string(15) "JSON_ERROR_NONE" NULL string(17) "JSON_ERROR_SYNTAX"
Output for 7.0.0 - 7.0.20
object(stdClass)#1 (1) { ["_empty_"]=> int(123) } string(15) "JSON_ERROR_NONE" NULL string(17) "JSON_ERROR_SYNTAX"
Output for 5.6.0 - 5.6.30, hhvm-3.15.4
object(stdClass)#1 (1) { ["_empty_"]=> int(123) } string(15) "JSON_ERROR_NONE" NULL string(15) "JSON_ERROR_NONE"