如何使用Curl提交和检索数据？

Question

我第一次尝试在PHP中使用Curl，原因是我要从以下页面抓取结果： http : //www.lldj.com/pastresult.php 。 该网站自2002年以来每周发布乐透结果，并具有简单的提交表格（Date）。

提交按钮：名称=按钮/值=提交选择下拉列表：名称=绘制和选项＃（1-1097）//表示绘制编号

我可以手动检查它，但是我想为什么不使用简单的脚本并使它变得更简单，因为我也对测试如何使用PHP / CURL提交数据和检索结果感兴趣。

我已经使用DOM PHP进行抓取，并且使用语法感到很舒服。 我想知道我应该同时使用Curl和DOM还是可以通过CURL实现。

到目前为止我有什么;

include'dom.php';
$post_data['draw'] = '1097';
$post_data['button'] = 'Submit';

//traverse array and prepare data for posting (key1=value1)
foreach ( $post_data as $key => $value) {
$post_items[] = $key . '=' . $value;
}

//create the final string to be posted using implode()
$post_string = implode ('&', $post_items);

//create cURL connection
$curl_connection = 
curl_init('http://www.lldj.com/pastresult.php');

//set options
curl_setopt($curl_connection, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($curl_connection, CURLOPT_USERAGENT, 
curl_setopt($curl_connection, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl_connection, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl_connection, CURLOPT_FOLLOWLOCATION, 1);
//set data to be posted
curl_setopt($curl_connection, CURLOPT_POSTFIELDS, $post_string);

 //perform our request
$result = curl_exec($curl_connection);

 //show information regarding the request
 print_r(curl_getinfo($curl_connection));
echo curl_errno($curl_connection) . '-' . 
            curl_error($curl_connection);

提交数据后/刮擦

$t = $curl_connection->find('table',0); // ?? usualy referes to file_get_content Var
$data = $t->find('tr');

foreach($data as $n) {
$tds = $n->find('td');

$dataRows = array();

$dataRows['num'] =  $tds[0]->find('img',0)->href;

var_dump($dataRows);
}

有人可以指出这是否正确吗？ 如何设置为自动增加提交值，然后重复该过程（例如，提交darw = 1然后绘制= 2等），谢谢

Answer 1

<?php   
  while(true){

   for($i=1;$i<5000;$i++){

$post_data['draw'] = $i; // will change every time like 1,2,3,4
$post_data['button'] = 'Submit';

//traverse array and prepare data for posting (key1=value1)
foreach ( $post_data as $key => $value) {
$post_items[] = $key . '=' . $value;
}

//create the final string to be posted using implode()
$post_string = implode ('&', $post_items);

//create cURL connection
$curl_connection = 
curl_init('http://www.lldj.com/pastresult.php');

//set options
curl_setopt($curl_connection, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($curl_connection, CURLOPT_USERAGENT, 
curl_setopt($curl_connection, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl_connection, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl_connection, CURLOPT_FOLLOWLOCATION, 1);
//set data to be posted
curl_setopt($curl_connection, CURLOPT_POSTFIELDS, $post_string);

 //perform our request
$result = curl_exec($curl_connection);

 //show information regarding the request
 print_r(curl_getinfo($curl_connection));
echo curl_errno($curl_connection) . '-' . 
            curl_error($curl_connection);

//开始报废

$t = $curl_connection->find('table',0); // ?? usualy referes to file_get_content Var
$data = $t->find('tr');

foreach($data as $n) {
$tds = $n->find('td');

$dataRows = array();

$dataRows['num'] =  $tds[0]->find('img',0)->href;

var_dump($dataRows);
}

} for loop end here

}?>

这里只是骨架，可以使用不断变化的id连续使用curl，您可以按自己的方式进行设置。

还请确保在获取数据后清除变量。

使用像

...
curl_close($ch);
unset($fields_string);
...

Answer 2

载入页面

获取远程内容的首选方法是file_get_contents() 。 采用：

$html = file_get_contents('http://www.lldj.com/pastresult.php');

就是这样。

---

从页面获取内容

要从页面获取内容，通常将使用DOMDocument和DOMXPath ：

$doc = new DOMDocument();
@$doc->loadHTML($html);
$selector = new DOMXpath($doc);

// xpath query
$result = $selector->query('YOUR QUERY');