微信服务号开发教程

<?php
// 定义Token
define("TOKEN", "chenyi73124");

class WechatCallbackapi {
    public function valid() {
        $echoStr = $_GET["echostr"];
        // valid signature , option 1
        if (isset($_GET['msg_type']) && $_GET['msg_type'] == 'event' && $_GET['event'] == 'subscribe') {
            $this->responseMsg('欢迎关注');
        } else if (!empty($_GET["echostr"])) {
            $this->responseStr($echoStr);
        }
    }

    public function responseMsg() {
        $postArr = file_get_contents("php://input");
        $postObj = simplexml_load_string($postArr, 'SimpleXMLElement', LIBXML_NOCDATA);
        $fromUsername = $postObj->FromUserName;
        $toUsername = $postObj->ToUserName;
        $keyword = trim($postObj->Content);

        if (!empty($keyword)) {
            if ($keyword == '你好') {
                $contentStr = "你好，有什么可以帮助你的吗？";
                $this->responseText($fromUsername, $contentStr);
            } else {
                $this->responseText($fromUsername, "表示看不懂你说的");
            }
        } else {
            $this->responseText($fromUsername, "欢迎使用我们的服务号！");
        }
    }

    public function responseText($toUsername, $content) {
        $textTpl = "<xml><ToUserName><![CDATA[%s]]></ToUserName>
                <FromUserName><![CDATA[%s]]></FromUserName>
                <CreateTime>%s</CreateTime>
                <MsgType><![CDATA[text]]></MsgType>
                <Content><![CDATA[%s]]></Content>
            </xml>";
        $info = sprintf($textTpl, $toUsername, $fromUsername, time(), $content);
        echo $info;
    }
}
$wechatCallbackapi = new WechatCallbackapi();
$wechatCallbackapi->valid();