renren/framework/builtin/userapi/api/baike.php

<?php 
$message = $this->message;

$ret = preg_match('/(?:百科|定义)(.*)/i', $this->message['content'], $matchs);
if(!$ret) {
	return $this->respText('请输入合适的格式, "百科+查询内容" 或 "定义+查询内容", 如: "百科姚明", "定义自行车"');
}
$word = $matchs[1];

$url = 'http://wapbaike.baidu.com/searchresult/?word=%s';
$url = sprintf($url, $word);

$resp = ihttp_get($url);
if ($resp['code'] == 200 && $resp['content']) {
	if(preg_match_all('/<div class="item"><h3><a href="(?P<link>.+?)">(?P<title>.+?)<\/a><\/h3><p>(?P<description>.+?)...<\/p><\/div>/', $resp['content'], $matchs)) {
		$ds = array();
		foreach($matchs['title'] as $key => $v) {
			$ds[] = array(
				'title' => str_replace('_百度百科', '', strip_tags($v)),
				'link' => 'http://wapbaike.baidu.com' . $matchs['link'][$key],
				'description' => strip_tags($matchs['description'][$key])
			);
		}
		$news = array();
		$news[] = array('title' => "{$word} 的百科解释如下", 'description' => $ds[0]['description'], 'picurl' => 'http://g.hiphotos.baidu.com/baike/c0%3Dbaike180%2C5%2C5%2C180%2C60/sign=f38225303901213fdb3e468e358e5db4/9358d109b3de9c82afcae8666c81800a18d8bc3eb0356b97.jpg', 'url' => $ds[0]['link']);
		$cnt = min(count($ds), 8);
		for($i = 0; $i < $cnt; $i++) {
			$news[] = array(
				'title' => $ds[$i]['title'],
				'description' => $ds[$i]['description'],
				'picurl' => '',
				'url' => $ds[$i]['link']
			);
		}
		return $this->respNews($news);
	}
}
return $this->respText('没有找到结果, 要不换个词试试?');