Messenger PHP chatbot接收更多JSON

Question

我的PHP chatbot使用php：// input接收多个JSON。它获取输入消息（这是正确的），但随后它接收到由机器人（响应）发送的消息，交付确认和读取确认的JSON。

我怎样才能保留第一个JSON？

我需要它，因为当我向我的机器人发送附件时会出现问题，它会处理错误的JSON而我无法从中获取URL。

我有这个代码来处理输入：

$input = json_decode(file_get_contents('php://input'), true);

file_put_contents('idkResponse.txt', file_get_contents('php://input') . PHP_EOL, FILE_APPEND);

我得到了所有这些JSON

{"object":"page","entry":[{"id":"XXXXX","time":1496729805870,"messaging":[{"sender":{"id":"XXXXX"},"recipient":{"id":"XXXXX"},"timestamp":1496729805429,"message":{"mid":"mid.$XXXXX","seq":1459814,"text":"Hey"}}]}]}

{"object":"page","entry":[{"id":"XXXXX","time":1496729806679,"messaging":[{"sender":{"id":"XXXXX"},"recipient":{"id":"XXXXX"},"timestamp":1496729806556,"message":{"is_echo":true,"app_id":XXXXX,"mid":"mid.$XXXXX","seq":1459815,"text":"Wut?"}}]}]}

{"object":"page","entry":[{"id":"XXXXX","time":1496729806873,"messaging":[{"sender":{"id":"XXXXX"},"recipient":{"id":"XXXXX"},"timestamp":1496729806873,"delivery":{"mids":["mid.$XXXXX"],"watermark":XXXXX,"seq":0}}]}]}

{"object":"page","entry":[{"id":"XXXXX","time":1496729808233,"messaging":[{"sender":{"id":"XXXXX"},"recipient":{"id":"XXXXX"},"timestamp":1496729808232,"read":{"watermark":XXXXX,"seq":0}}]}]}

谢谢