json_decode($str,true)的结果为null
//$result为传进来的json值
$result = $this->params['auth_result'];
//html_entity_decode进行HTML 实体转换为字符
//stripslashes() 函数的作用是删除反斜杠
$info = stripslashes(html_entity_decode($result));
$resultCode = json_decode($info,true);
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