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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 git.master, git.master_jit, rfc.property-hooks
object(stdClass)#1 (1) { [""]=> int(123) } string(15) "JSON_ERROR_NONE" NULL string(17) "JSON_ERROR_SYNTAX"

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