Use PHP to crawl StarCraft 2 game data

In recent years, with the rapid development of the game industry, many gamers have begun to pay attention to game data. As for the game "StarCraft 2" (hereinafter referred to as SC2), its rich game data is undoubtedly a major feature that attracts many players. In order to better understand the game situation, many players want to use programming skills to obtain game data. This article will introduce how to use the PHP programming language to implement the process of crawling SC2 game data.

1. Crawling web pages

Before we start crawling SC2 game data, we need to first understand how to crawl a web page. Here, we will use the cURL function in PHP to achieve this. cURL is a library for transferring data, supporting many protocols including HTTP, HTTPS, FTP, and more. It can easily crawl web pages through PHP.

Here we take SC2 community posts as an example to crawl. In the SC2 community's post list, each post has a unique ID number that identifies the post. We can obtain game data by crawling the content in this post.

The following is a sample code that uses the cURL function to obtain the content of the SC2 community post:

$post_id = '123456'; // Post ID number
$url = 'https://us.battle.net/forums/en/sc2/topic/'.$post_id; // Post link
$ch = curl_init($url); // Initialize cURL
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1); // Set the return value to a string
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Set SSL to ignore the certificate
$content = curl_exec($ch); // Execute Request, get the post content
curl_close($ch); // Close cURL
echo $content; // Output the post content
?>

In the above code, we first define Post ID number and post link, then use the curl_init function to initialize the cURL object, and use the curl_setopt function to set relevant parameters. Here we set the return value to a string and ignore the SSL certificate to avoid request failure due to certificate issues.

Finally, we use the curl_exec function to execute the request and obtain the post content, and the curl_close function is used to close cURL and release resources. Finally, we can output the post content to observe the results.

2. Parsing web pages

The process of crawling web pages is to obtain the original codes of the web pages, but these codes do not neatly present the data in tables or other forms. Therefore, we need to parse the content of the crawled web pages and extract the data we are concerned about.

In PHP, we use DOMDocument objects and XPath query statements to parse web pages. DOMDocument is a built-in PHP class that can read and manipulate XML documents. The XPath query statement is a query language used to locate XML or HTML document nodes.

The following is a sample code that uses DOMDocument and XPath query statements to parse the content of SC2 community posts:

$post_id = '123456'; // Post ID number
$url = 'https://us.battle.net/forums/en/sc2/topic/'.$post_id; // Post link
$ch = curl_init($url); // Initialize cURL
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // Set the return value to a string
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Set SSL to ignore the certificate
$content = curl_exec($ch); //Execute the request and get the post content
curl_close($ch); //Close cURL

$doc = new DOMDocument();
@$doc->loadHTML($content); // Parse the obtained HTML code

$xpath = new DOMXpath($doc);
$elements = $xpath->query('(//*[@id="post-1 "])[1]//div[@class="TopicPost-bodyContent"]');
// Use XPath query to locate the content area of ​​the post
foreach ($elements as $element) {

echo $doc->saveHtml($element);

}
?>

In the above code, we first obtain the original content of the SC2 community post, and then use the DOMDocument object to parse the content into an object. Next, we use XPath query statements to locate the content part of the post, and finally use a foreach loop to output the content of this part.

3. Analyze data

After completing parsing the web page, we need to analyze the data in the web page in order to organize it into the data we need. Here, we take the example of obtaining player performance data from SC2 community posts for analysis.

The following is a sample code for data analysis using regular expressions and PHP arrays:

$post_id = '123456'; // Post ID number
$url = 'https://us.battle.net/forums/en/sc2/topic/'.$post_id; // Post link

$data = array(); // Store the parsed Data

$ch = curl_init($url); //Initialize cURL
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //Set the return value to a string
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER , false); //Set SSL to ignore the certificate
$content = curl_exec($ch); //Execute the request and get the post content
curl_close($ch); //Close cURL

$ doc = new DOMDocument();
@$doc->loadHTML($content); // Parse the obtained HTML code

$xpath = new DOMXpath($doc);
$ elements = $xpath->query('(//*[@id="post-1"])[1]//div[@class="TopicPost-bodyContent"]');
// Use XPath query locates the content area of ​​the post
foreach ($elements as $element) {

$html_content = $doc->saveHtml($element);

// 使用正则表达式匹配玩家战绩数据
$pattern = '/<strong>([a-zA-Z]+)</strong>

(¹ )/';

preg_match_all($pattern, $html_content, $matches);

// 整理数据
for ($i = 0; $i < count($matches[0]); $i++) {
    $data[] = array(
        'race' => trim($matches[1][$i]),
        'win_loss' => trim($matches[2][$i]),
    );
}

}

// 输出整理后的数据
foreach ($data as $item) {

echo $item['race'] . ' ' . $item['win_loss'] . PHP_EOL;

}
?>

在以上代码中，我们使用正则表达式匹配玩家战绩数据。具体来说，我们使用模式匹配玩家使用的种族和战绩，将其整理为一个数组。最后，我们使用foreach循环输出整理后的数据。

总结

通过本文，我们了解到了如何使用PHP编程语言实现爬取SC2游戏数据的过程。在实际编程时，我们需要灵活运用各种编程技能，包括网页爬取、数据解析和分析等。对于刚开始接触编程的玩家而言，这是一个不错的练手项目，可以帮助他们提高编程能力，同时也能更好地了解自己在SC2游戏中的表现和排名。

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