利用simsimi小黄鸡接口，做一个微信公共账号上的机器人

<?php
/**
* wechat php test
*/

//define your token
define("TOKEN", "ichat");
$wechatObj = new wechatCallbackapiTest();
//$wechatObj->valid();
$wechatObj->responseMsg();
class wechatCallbackapiTest
{
public function valid()
{
$echoStr = $_GET["echostr"];

//valid signature , option
if($this->checkSignature()){
echo $echoStr;
exit;
}
}

public function responseMsg()
{
//get post data, May be due to the different environments
$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

//extract post data
if (!empty($postStr)){

$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
$fromUsername = $postObj->FromUserName;
$toUsername = $postObj->ToUserName;
$keyword = trim($postObj->Content);
$time = time();
$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[%s]]></MsgType>
<Content><![CDATA[%s]]></Content>
<FuncFlag>0</FuncFlag>
</xml>";
if(!empty( $keyword ))
{
$msgType = "text";
//$contentStr = "Welcome to wechat world!";
$test=new Test();
$contentStr=$test->simsimi($keyword);
$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
echo $resultStr;
}else{
echo "Input something...";
}

}else {
echo "";
exit;
}
}

private function checkSignature()
{
$signature = $_GET["signature"];
$timestamp = $_GET["timestamp"];
$nonce = $_GET["nonce"];

$token = TOKEN;
$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr);
$tmpStr = implode( $tmpArr );
$tmpStr = sha1( $tmpStr );

if( $tmpStr == $signature ){
return true;
}else{
return false;
}
}
}
////////////////////////////////
class Test
{
public function simsimi($value)
{
$qurl='http://sandbox.api.simsimi.com/request.p?key=b778105e-2152-4a83-b3f4-d03cd0bfb2c5&lc=ch&ft=1.0&text='.$value;//记得不要忘记了key
$fetch= new BaeFetchUrl();//这是在百度云上的，新浪云收费，而百度云免费，方法也差不多
$content=$fetch->get($qurl);
$result=json_decode($content,true);
return $result['response'];

}

}
?>