PHP使用CURL实现多线程抓取网页_PHP教程

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$urls = array(

'http://www.sina.com.cn/',

'http://www.sohu.com/',

'http://www.163.com/'

); // 设置要抓取的页面URL

$save_to='/test.txt'; // 把抓取的代码写入该文件

$st = fopen($save_to,"a");

$mh = curl_multi_init();

foreach ($urls as $i => $url) {

$conn[$i] = curl_init($url);

curl_setopt($conn[$i], CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)");

curl_setopt($conn[$i], CURLOPT_HEADER ,0);

curl_setopt($conn[$i], CURLOPT_CONNECTTIMEOUT,60);

curl_setopt($conn[$i], CURLOPT_FILE,$st); // 设置将爬取的代码写入文件

curl_multi_add_handle ($mh,$conn[$i]);

} // 初始化

do {

curl_multi_exec($mh,$active);

} while ($active); // 执行

foreach ($urls as $i => $url) {

curl_multi_remove_handle($mh,$conn[$i]);

curl_close($conn[$i]);

} // 结束清理

curl_multi_close($mh);

fclose($st);

?>

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$urls = array(

'http://www.sina.com.cn/',

'http://www.sohu.com/',

'http://www.163.com/'

);

$save_to='/test.txt'; // 把抓取的代码写入该文件

$st = fopen($save_to,"a");

$mh = curl_multi_init();

foreach ($urls as $i => $url) {

$conn[$i] = curl_init($url);

curl_setopt($conn[$i], CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)");

curl_setopt($conn[$i], CURLOPT_HEADER ,0);

curl_setopt($conn[$i], CURLOPT_CONNECTTIMEOUT,60);

curl_setopt($conn[$i],CURLOPT_RETURNTRANSFER,true); // 设置不将爬取代码写到浏览器，而是转化为字符串

curl_multi_add_handle ($mh,$conn[$i]);

}

do {

curl_multi_exec($mh,$active);

} while ($active);

foreach ($urls as $i => $url) {

$data = curl_multi_getcontent($conn[$i]); // 获得爬取的代码字符串

fwrite($st,$data); // 将字符串写入文件。当然，也可以不写入文件，比如存入数据库

} // 获得数据变量，并写入文件

foreach ($urls as $i => $url) {

curl_multi_remove_handle($mh,$conn[$i]);

curl_close($conn[$i]);

}

curl_multi_close($mh);

fclose($st);

?>