如何获取微信文章封面和文章标题！

{
title: '【福利】免费领取一个月腾讯视频会员' // 标题
digest: "【福利】免费领取一个月腾讯视频会员",   // 描述
content_url: "",    // 内容天
cover: "",  // 封面
wechatname: "故事胶片",   // 名称
}

/**
* 微信公众号文章爬取类
* 使用方法：
* $crawler = new WxCrawler();
* $content = $crawler->crawByUrl($url);
*/

/** @var 代理  */
protected $agent = [
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Acoo Browser; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)",
"Mozilla/4.0 (compatible; MSIE 7.0; AOL 9.5; AOLBuild 4337.35; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
"Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)",
"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Media Center PC 6.0)",
"Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 1.0.3705; .NET CLR 1.1.4322)",
"Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.04506.30)",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN) AppleWebKit/523.15 (KHTML, like Gecko, Safari/419.3) Arora/0.3 (Change: 287 c9dfb30)",
"Mozilla/5.0 (X11; U; Linux; en-US) AppleWebKit/527+ (KHTML, like Gecko, Safari/419.3) Arora/0.6",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070215 K-Ninja/2.1.1",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9) Gecko/20080705 Firefox/3.0 Kapiko/3.0",
"Mozilla/5.0 (X11; Linux i686; U;) Gecko/20070322 Kazehakase/0.4.5",
"Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.20 (KHTML, like Gecko) Chrome/19.0.1036.7 Safari/535.20",
"Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; fr) Presto/2.9.168 Version/11.52",
];
public $host = '';
public $header = '';
public $referer = '';
public $antiLeech = '';

/** @var 初始化curl信息  */
$this->header  = $this->agent[rand(0,count($this->agent) - 1)];
$this->referer = empty($referer)?'http://weixin.sogou.com/' : $referer;
$this->host    = empty($host)?'weixin.sogou.com' : $host;
/** @var 处理微信图片的防盗链 */
$this->antiLeech = 'http://'.$_SERVER['SERVER_NAME'].'/tool.php?url=';

/**
 * 爬取内容
 * @author bignerd
 * @since  2016-08-16T10:13:58+0800
 * @param  $url
 */
$ch=curl_init($url);
$options = [
    CURLOPT_USERAGENT => $this->agent,
    CURLOPT_REFERER => $this->referer,
];
curl_setopt_array($ch,$options);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_BINARYTRANSFER,true);
curl_setopt($ch,CURLOPT_TIMEOUT,60);
$output=curl_exec($ch);
return $output;
$content = $this->_get($url);
$basicInfo = $this->articleBasicInfo($content);
list($content_html, $content_text) = $this->contentHandle($content);
return array_merge($basicInfo,['content_html' => $content_html,'content_text' => $content_text]);

/**
 * 处理微信文章源码，提取文章主体，处理图片链接
 * @author bignerd
 * @since  2016-08-16T15:59:27+0800
 * @param  $content 抓取的微信文章源码
 * @return [带图html文本，无图html文本]
 */
public function contentHandle($content)
{
    $content_html_pattern = '/<div class="rich_media_content " id="js_content">(.*?)<\/div>/s';
    preg_match_all($content_html_pattern, $content, $html_matchs);
    $content_html = $html_matchs[0][0];
/** @var  带图片html文本 */
    $content_html = preg_replace_callback('/data-src="(.*?)"/', function($matches){
return 'src='.$this->antiLeech.urlencode($matches[1]);
    }, $content_html);
/** @var  无图html文本 */
    $content_text = preg_replace('/<img.*?>/s','',$content_html);
return [$content_html,$content_text];
}

/**
 * 获取文章的基本信息
 * @author bignerd
 * @since  2016-08-16T17:16:32+0800
 * @param  $content 文章详情源码
 * @return $basicInfo
 */
//待获取item                
$item = [
'ct' => 'date',//发布时间
'msg_title' => 'title',//描述
'msg_desc' => 'digest',//描述
'msg_link' => 'content_url',//文章链接
'msg_cdn_url' => 'cover',//封面图片链接
'nickname' => 'wechatname',//公众号名称
];
$basicInfo = [
'author' => '',
'copyright_stat' => '',
];
foreach ($item as $k => $v) {
if ($k == 'msg_title') {
        $pattern = '/ var '.$k." = '(.*?)'/s";
    } else {
        $pattern = '/ var '.$k.' = "(.*?)";/s';
    }
    preg_match_all($pattern,$content,$matches);
if(array_key_exists(1, $matches) && !empty($matches[1][0])){
        $basicInfo[$v] = $this->htmlTransform($matches[1][0]);
    } else {
        $basicInfo[$v] = '';
    }
}
/** 获取作者 */
preg_match('/<em class="rich_media_meta rich_media_meta_text">(.*?)<\/em>/s', $content, $matchAuthor);
if(!empty($matchAuthor[1])) $basicInfo['author'] = $matchAuthor[1];
/** 文章类型 */
preg_match('/<span id="copyright_logo" class="rich_media_meta meta_original_tag">(.*?)<\/span>/s', $content, $matchType);
if(!empty($matchType[1])) $basicInfo['copyright_stat'] = $matchType[1];
return $basicInfo;

/**
* 特殊字符转换
* @author bignerd
* @since  2016-08-16T17:30:52+0800
* @param  $string
* @return $string
*/
$string = str_replace('"','"',$string);
$string = str_replace('&','&',$string);
$string = str_replace('amp;','',$string);
$string = str_replace('<','<',$string);
$string = str_replace('>','>',$string);
$string = str_replace(' ',' ',$string);
$string = str_replace("\\", '',$string);
return $string;