PHP如何使用curl实现数据抓取

导语：PHP如何使用curl实现数据抓取呢?下面是小编给大家提供的.实现代码，大家可以参考阅读，更多详情请关注应届毕业生考试网。

<?php

define ( 'IS_PROXY', true ); //是否启用代理

function async_get_url($url_array, $wait_usec = 0)

{

if (!is_array($url_array))

return fALse;

$wait_usec = intval($wait_usec);

$data = array();

$handle = array();

$running = 0;

$mh = curl_multi_init(); // 开启多线程

$i = 0;

foreach($url_array as $url) {

$ch = curl_init();

if (IS_PROXY) {

//以下代码设置代理服务器

//代理服务器地址 !!Hong Kong, China的速度比较好

curl_setopt ($ch, CURLOPT_PROXY,'' );

}

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return don't print

curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置超时时间

curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // 302 redirect

curl_setopt($ch, CURLOPT_MAXREDIRS, 7); //HTTp定向级别

curl_multi_add_handle($mh, $ch); // 把 curl resource 放进 multi curl handler 里

$handle[$i++] = $ch;

}

/* 执行 */

do {

$mrc = curl_multi_exec($mh, $running);

if ($wait_usec > 0) /* 每个 connect 要间隔多久 */

usleep($wait_usec); // 250000 = 0.25 sec

} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($running && $mrc == CURLM_OK) {

if (curl_multi_select($mh) != -1) {

do {

$mrc = curl_multi_exec($mh, $running);

} while ($mrc == CURLM_CALL_MULTI_PERFORM);

}

}

/* 读取资料 */

foreach($handle as $i => $ch) {

$content = curl_multi_getcontent($ch);

$data[$i] = (curl_errno($ch) == 0) ? $content : false;

}

/* 移除 handle*/

foreach($handle as $ch) {

curl_multi_remove_handle($mh, $ch);

}

curl_multi_close($mh);

return $data;

}

$urls = array('');

$re = async_get_url($urls);

echo $re[0];

?>