简单的实现微信平台开发

<?php
define ( "TOKEN", "weixin" );
$wechatObj = new wechatCallbackapiTest ();

if (isset ( $_GET ['echostr'] )) {
	$wechatObj->valid ();
} else {
	$wechatObj->responseMsg ();
}
class wechatCallbackapiTest {
	
	// 验证Token
	public function valid() {
		$echoStr = $_GET ["echostr"];
		if ($this->checkSignature ()) {
			echo $echoStr;
			exit ();
		}
	}
	
	// 验证签名
	private function checkSignature() {
		$signature = $_GET ["signature"];
		$timestamp = $_GET ["timestamp"];
		$nonce = $_GET ["nonce"];
		
		$token = TOKEN;
		$tmpArr = array (
				$token,
				$timestamp,
				$nonce 
		);
		sort ( $tmpArr, SORT_STRING );
		$tmpStr = implode ( $tmpArr );
		$tmpStr = sha1 ( $tmpStr );
		
		if ($tmpStr == $signature) {
			return true;
		}
		return false;
	}
	
	/* 回应 */
	public function responseMsg() {
		$postStr = $GLOBALS ["HTTP_RAW_POST_DATA"];
		if (! empty ( $postStr )) {
			$postObj = simplexml_load_string ( $postStr, 'SimpleXMLElement', LIBXML_NOCDATA );
			$RX_TYPE = trim ( $postObj->MsgType );
			
			switch ($RX_TYPE) {
				//接收关注/取消关注、扫描带参数二维码【未关注时，进行关注后、用户已关注】、上报地理位置、自定义菜单【点击菜单拉取消息、点击菜单跳转链接】
				case "event" :
					$result = $this->receiveEvent ( $postObj );
					break;
				//接收普通的文字、图片、媒体消息
				case "text" :
					$result = $this->receiveText ( $postObj );
					break;
			}
			echo $result;
		} else {
			echo "";
			exit ();
		}
	}
	// 处理接收到用户发送的消息
	private function receiveEvent($object) {
		$content = "";
		switch ($object->Event) {
			//关注
			case "subscribe" :
				$content = "感谢您的关注，本账号目前还\n在测试阶段，给您带来的不便请谅解！";
				break;
			//取消关注
			case 'unsubscribe':
				$content = "欢迎您再次关注我们“女人要懂得爱自己”！";
				break;
		}
		if (is_array ( $content )) {
			$result = $this->transmitNews ( $object, $content );
		} else {
			$result = $this->transmitText ( $object, $content );
		}
		return $result;
	}
	
	/* 处理接收到的文本 */
	private function receiveText($object) {
		$keyword = trim ( $object->Content );
		if (strstr ( $keyword, "四六级" ) || strstr ( $keyword, "英语" )) {
			$content = array ();
			$content [] = array (
					"Title" => "2014年6月全国大学英语四六级考试成绩查询",
					"Description" => "",
					"PicUrl" => "http://img003.21cnimg.com/photos/album/20141104/m600/B2579ABF2B905FA793C6756A59044992.jpeg",
					"Url" => "http://apix.sinaapp.com/cet/index.php?openid=" . $object->FromUserName 
			);
			$content [] = array (
					"Title" => "刘强东带奶茶妹妹看牙 两人旁若无人地忘情缠绵(图)",
					"Description" => "",
					"PicUrl" => "",
					"Url" => "http://news.21cn.com/social/shixiang/a/2014/1105/11/28502924.shtml" 
			);
		} else {
			$content = date ( "Y-m-d H:i:s", time () ) . "\n目前正在测试阶段";
		}
		if (is_array ( $content )) {
			$result = $this->transmitNews ( $object, $content );
		} else {
			$result = $this->transmitText ( $object, $content );
		}
		return $result;
	}
	
	/* 输出文章 */
	private function transmitText($object, $content) {
		$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
</xml>";
		$result = sprintf ( $textTpl, $object->FromUserName, $object->ToUserName, time (), $content );
		return $result;
	}
	
	/* 输出图文 */
	private function transmitNews($object, $arr_item) {
		if (! is_array ( $arr_item ))
			return;
		
		$itemTpl = "
		<item>
		        <Title><![CDATA[%s]]></Title>
		        <Description><![CDATA[%s]]></Description>
		        <PicUrl><![CDATA[%s]]></PicUrl>
		        <Url><![CDATA[%s]]></Url>
		</item>
		";
		$item_str = "";
		foreach ( $arr_item as $item )
			$item_str .= sprintf ( $itemTpl, $item ['Title'], $item ['Description'], $item ['PicUrl'], $item ['Url'] );
		
		$newsTpl = "<xml>
    	<ToUserName><![CDATA[%s]]></ToUserName>
    	<FromUserName><![CDATA[%s]]></FromUserName>
    	<CreateTime>%s</CreateTime>
    	<MsgType><![CDATA[news]]></MsgType>
    	<Content><![CDATA[]]></Content>
    	<ArticleCount>%s</ArticleCount>
    	<Articles>
    		$item_str
    	</Articles>
    	</xml>";
		
		$result = sprintf ( $newsTpl, $object->FromUserName, $object->ToUserName, time (), count ( $arr_item ) );
		return $result;
	}
}
?>