接口返回的json中有特殊的字符

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         $content=str_replace(array("\r\n","\r","\n"),"",$content);

         当json_decode 无法解析某些接口的返回值的时候,可能是json里面存在些不可见的\n \r\n \r 等

         如果是上面这些造成的, 过滤掉他们就ok了!!

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