cURL 学习笔记与总结（2）网页爬虫、天气预报

<?php
/*
    获取百度html的简单网页爬虫
*/
$curl = curl_init(‘http://www.baidu.com‘); //resource(2, curl)
curl_exec($curl);
curl_close($curl);

<?php
/*
    下载一个网页（百度）并把内容中的百度替换成‘PHP‘之后输出
*/
$curl = curl_init(); 
curl_setopt($curl, CURLOPT_URL, ‘http://www.baidu.com‘); //设置访问网页的url
curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);         //执行之后不直接打印出来
$output = curl_exec($curl);     //执行
curl_close($curl);                //关闭cURL
echo str_replace(‘百度‘,‘PHP‘,$output);

<?php
/*
    cURL调用WebService查询北京的当前天气 
*/
$data = ‘theCityName=北京‘;
$curl = curl_init();
curl_setopt($curl,CURLOPT_URL,‘http://www.webxml.com.cn/WebServices/WeatherWebService.asmx/getWeatherbyCityName‘);
curl_setopt($curl,CURLOPT_HEADER,0);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
curl_setopt($curl,CURLOPT_POST,1); //post方式
curl_setopt($curl,CURLOPT_POSTFIELDS,$data); //设置post的参数
curl_setopt($curl,CURLOPT_HTTPHEADER,array(‘application/x-www-form-urlencoded;charset=utf-8‘,‘Content-length: ‘.strlen($data)));
curl_setopt($curl, CURLOPT_USERAGENT, "user-agent:Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20100101 Firefox/24.0"); //解决错误：“未将对象引用设置到对象的实例。”
$rtn = curl_exec($curl);
if(!curl_errno($curl)){
    //$info = curl_getinfo($curl);
    //print_r($info);
    echo $rtn;
}else{
    echo ‘curl error: ‘.curl_error($curl);
}
curl_close($curl);

C:\Users\Administrator>d:

D:\>cd practise/php/curl

D:\practise\php\curl>php -f weather.php > weather.txt