How to retrieve isbn in PHP

PHP uses the `curl` library to send HTTP requests, parse the response data, extract the required book information, and perform corresponding processing and display to achieve retrieval of isbn. Detailed introduction: 1. The `searchISBN` function accepts an ISBN as a parameter; 2. Use the `curl` library to send an HTTP request to the specified URL; 3. After receiving the HTTP response, use the `json_decode` function to parse the response data into An associative array and so on.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP is a widely used server-side scripting language. It has powerful functions and flexible features and can be used to develop various types of Web applications. When developing web applications, it is often necessary to implement data retrieval and query functions. This article will introduce how to use PHP to implement the function of retrieving ISBN (International Standard Book Number).

ISBN is an international standard number used to identify books. It consists of 13 digits. In libraries, bookstores and online bookstores, we often need to find and retrieve book-related information based on ISBN, such as book title, author, publisher, etc. The following is a sample code that uses PHP to implement ISBN retrieval:

function searchISBN($isbn) {
// 创建一个HTTP请求
$url = "https://www.example.com/search?isbn=" . $isbn;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);
// 解析HTTP响应
$data = json_decode($response, true);
// 提取图书信息
$bookTitle = $data['title'];
$bookAuthor = $data['author'];
$bookPublisher = $data['publisher'];
// 返回图书信息
return array(
'title' => $bookTitle,
'author' => $bookAuthor,
'publisher' => $bookPublisher
);
}
// 调用检索函数
$isbn = "9781234567890";
$bookInfo = searchISBN($isbn);
// 打印图书信息
echo "书名：" . $bookInfo['title'] . "
";
echo "作者：" . $bookInfo['author'] . "
";
echo "出版社：" . $bookInfo['publisher'] . "
";
?>

In the above code, the `searchISBN` function accepts an ISBN as a parameter, and then uses the `curl` library to send an HTTP request to the specified URL. Includes ISBN as query parameter. In the sample code we use an imaginary URL `https://www.example.com/search`, you need to replace it with the URL of the actual search service.

After receiving the HTTP response, we use the `json_decode` function to parse the response data into an associative array. Then, we extract the book's title, author, publisher and other information from the associative array and store it in a new associative array. Finally, we return this associative array containing book information.

In the main program, we call the `searchISBN` function and pass an ISBN to it as a parameter. Then, we extract the title, author, publisher and other information from the returned book information and print it out.

It should be noted that the URL and data format of the actual retrieval service may be different, and you need to make corresponding modifications according to the actual situation.

To sum up, it is not complicated to use PHP to implement the function of retrieving ISBN. We only need to use the `curl` library to send HTTP requests, parse the response data, extract the required book information, and process and display it accordingly. In this way, we can easily retrieve and obtain relevant information about books based on ISBN .

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