微信公众号跳转到小程序

方法一

发送消息 

https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=

文本方式

$txt = '{
"touser":"xxx",
"msgtype":"miniprogrampage",
"miniprogrampage":{
"title":"XX小程序",
"appid":"小程序的appid",
"pagepath":"pages/index/authorize",
"thumb_media_id":"媒体id"
}
}';

方法二

用文本方式

$result = '<a data-miniprogram-appid="小程序的appid" data-miniprogram-path="pages/index/authorize" href="http://www.qq.com">跳转到小程序</a>';

参考接口详细信息https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Service_Center_messages.html#%E5%8F%91%E9%80%81%E5%B0%8F%E7%A8%8B%E5%BA%8F%E5%8D%A1%E7%89%87