How to implement URL Chinese transcoding in ThinkPHP

It is a very common requirement to use Chinese characters in URLs. For example, in forums, the title of a post is often in Chinese, and it needs to be used as part of the URL to generate the page address. However, due to historical reasons and protocol restrictions, URLs can only use characters that exist in the ASCII code table. In order to be able to generate URL addresses using Chinese characters, we need a way to convert these characters into safe URL characters.

A common transcoding method is to use the urlencode function. The purpose of this function is to convert Chinese characters into a special hexadecimal encoding to avoid causing conflicts in URLs. In ThinkPHP, we can use the url function for URL encoding. For example:

$url = url('/index/index', ['title' => urlencode('中文内容')]);

In this example, we convert the Chinese content into urlencode encoding and pass it to our controller method as the title parameter. In the controller method, we can use the urldecode function to restore the transcoded Chinese characters. For example:

public function index($title)
{
    $title = urldecode($title);
    // ...
}

This method is feasible, but it has a significant disadvantage, that is, the hexadecimal-encoded string is usually much longer than the original Chinese string, which will cause the URL Became very ugly and unmemorable.

URL encoding of Chinese characters can be achieved by using URL-safe Base64 encoding, thereby solving this problem. In ThinkPHP, we can use base64url_encode and base64url_decode functions. For example:

$url = url('/index/index', ['title' => base64url_encode('中文内容')]);

In this example, we encode the Chinese content using URL-safe Base64 and pass it to our controller method as the title parameter. We can use the base64url_decode function in the controller method to decode it into original Chinese characters. For example:

public function index($title)
{
    $title = base64url_decode($title);
    // ...
}

The method of using Base64 encoding has an obvious advantage over the urlencode method, that is, the encoded string it generates is relatively short, more beautiful and easier to read. However, it should be noted that when this method generates a URL-safe string, you need to use some special characters to replace the original Base64 characters, such as replacing the symbol with -, replacing the symbol / with _, and removing the = that may appear at the end. symbol.

In actual development, we can choose the appropriate transcoding method according to our own needs. Whether it is urlencode or Base64 encoding, we need to pay attention to whether the generated URL conforms to the specification, and perform correct decoding processing in the controller method to ensure that our application can properly handle URLs with Chinese characters.

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