function baidu_record() {
$url='http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

if(checkBaidu($url)==1)
{echo "百度已收录";
}
else
{echo "百度未收录";}
}

   function checkBaidu($url) {
    $url = 'http://www.baidu.com/s?wd=' . urlencode($url);
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $rs = curl_exec($curl);
    curl_close($curl);
    if (!strpos($rs, '没有找到')) { //没有找到说明已被百度收录 
        return 1;
    } else {
        return -1;
    }
}

<!--百度收录-->
<li class="meta-categories"><i class="pull-right text-muted" aria-hidden="true"></i> <span class="baidu-record"><?php echo baidu_record() ?></span></li>