如何使用Curl提交和檢索數據？

Question

我第一次嘗試在PHP中使用Curl，原因是我要從以下頁面抓取結果： http : //www.lldj.com/pastresult.php 。 該網站自2002年以來每周發布樂透結果，並具有簡單的提交表格（Date）。

提交按鈕：名稱=按鈕/值=提交選擇下拉列表：名稱=繪制和選項＃（1-1097）//表示繪制編號

我可以手動檢查它，但是我想為什么不使用簡單的腳本並使它變得更簡單，因為我也對測試如何使用PHP / CURL提交數據和檢索結果感興趣。

我已經使用DOM PHP進行抓取，並且使用語法感到很舒服。 我想知道我應該同時使用Curl和DOM還是可以通過CURL實現。

到目前為止我有什么;

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);

提交數據后/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);
}

有人可以指出這是否正確嗎？ 如何設置為自動增加提交值，然后重復該過程（例如，提交darw = 1然后繪制= 2等），謝謝

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);

//開始報廢

$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

}?>

這里只是骨架，可以使用不斷變化的id連續使用curl，您可以按自己的方式進行設置。

還請確保在獲取數據后清除變量。

使用像

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

Answer 2

載入頁面

獲取遠程內容的首選方法是file_get_contents() 。 采用：

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

就是這樣。

---

從頁面獲取內容

要從頁面獲取內容，通常將使用DOMDocument和DOMXPath ：

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

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