Use curl to create a simple Baidu search

In the past few days, I have studied the curl library in php and made a simple Baidu search. First, enter the code

<div style="width:200px;height:100px;">
    <div>百度搜索</div>
    <form action="" method="get">
        <input type="text" name="key">
        <input type="submit" value="搜索">
    </form>
</div>
<?php
$k = &#39;&#39;;
$k = !empty($_GET[&#39;key&#39;])?$_GET[&#39;key&#39;]:&#39;&#39;;
session_start();
$_SESSION[&#39;key&#39;] = $k;

$curl = curl_init(); 
// 设置你需要抓取的URL 

for($i = 0;$i<2;$i++){
curl_setopt($curl, CURLOPT_URL, "http://www.baidu.com/s?wd={$_SESSION[&#39;key&#39;]}&pn={$i}"); 
// 设置header 
curl_setopt($curl, CURLOPT_HEADER, 1); 
// 设置cURL 参数，要求结果保存到字符串中还是输出到屏幕上。 
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); 
// 运行cURL，请求网页 
$data = curl_exec($curl); 

$pre = &#39;/<h3 class="t"><a.*?href = "(.*?)".*?target="_blank".*?>(.*?)<\/a><\/h3>/s&#39;;
preg_match_all($pre,$data,$match);

foreach ($match[1] as $k => $v) {
?>    
<div style="font-size:20px;color:red;">
    <a href="<?php echo $v;?>" target="_blank"><?php echo strip_tags($match[2][$k]);?></a>
</div>
<?php
}
}

curl_close($curl);


?>

After analyzing the URLs in Baidu searches, I found a pattern

https://www.baidu. com/s?wd=Search keyword

But I found that after using the https protocol, I could not obtain the data on Baidu, so I changed it to http://www.baidu.com?wd=Search keyword!!