php使用curl请求数据（采集数据）

 <?php

 $url = "http://www.baidu.com/s?wd=刘俊涛的博客";

 $header = array(
     'User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36',
 );
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 // 执行
 $content = curl_exec($ch);
 if ($content == false) {
     echo "error:" . curl_error($ch);
 }
 // 关闭
 curl_close($ch);

 //输出结果
 echo ($content);