How to generate temporary link scheme in php

As the Internet continues to develop, the methods of transmitting data and information are constantly updated and changed. In this Internet age, we often need to share some temporary links, such as sharing a picture, a video or a document. These links usually have a characteristic that they are only valid within a specific period of time and cannot be accessed after this time.

In this case, we need a solution to generate temporary links. This article will explain how to use PHP to generate temporary links to ensure you can share data or information with others easily and securely.

1. What is a temporary link?

Temporary links are links that are only available during a specific period of time. For example, you might want to share a set of photos with a friend, but don't want them to retain access permanently. In this case, you can create a temporary link that will be valid for a specified period of time. After this time, the link will automatically expire to avoid your privacy and security issues.

2. The scheme of generating temporary links

The scheme of generating temporary links can be implemented through a variety of programming languages, but since PHP is widely used in web development, we choose to use PHP language to implement.

There are many ways to generate temporary links. The following is a scheme based on time limits.

First, we need to generate a unique identifier to identify the generated link. Here we can use PHP's built-in function uniqid() to generate a unique identifier. In practical applications, we can also encrypt the generated identifier to increase security.

$token = uniqid();

Next, we need to record the time and validity period of the generated link so that we can later determine whether it is valid. We can use PHP's time functions time() and strtotime() to get the timestamp of the current time and the specified time.

$start_time = time(); // 获取当前时间戳
$end_time = strtotime("+1 day"); // 有效期为1天

Finally, we store the issued token and validity period in a database or file to later verify that the link is valid. Here we use an array to represent the generated links and save it as a json string in a file.

$link = array(
    'token' => $token,
    'start_time' => $start_time,
    'end_time' => $end_time
);
$link_json = json_encode($link);
file_put_contents("links.txt", $link_json."\n", FILE_APPEND);

Through the above steps, we have generated a temporary link, now we need to write a verification function to check whether the link is valid. The method to check whether the link is valid is as follows:

function check_link($token) {
    $links_file = file_get_contents('links.txt');
    $links = explode("\n", trim($links_file));
    foreach ($links as $link_str) {
        if (!empty($link_str)) {
            $link = json_decode($link_str, true);
            if ($link['token'] == $token && $link['end_time'] > time()) {
                return true;
            }
        }
    }
    return false;
}

In practical applications, we usually need to check whether the link is valid to protect the security of data or information. If the link is expired or incorrect, we can return an error message or redirect to another page.

3. Summary

Through the introduction of this article, we learned how to use PHP to generate temporary links and how to check the validity of the link. There are many ways to generate temporary links, and we can choose different solutions according to specific needs. Through temporary links, we can share data and information more safely and conveniently, and applying it to actual development will bring more convenience.

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