Url transfer of Chinese characters, solutions for special dangerous characters (for reference only) urldecode, base64_encode_PHP tutorial

Url transfer of Chinese characters, solutions for special dangerous characters (for reference only) urldecode, base64_encode. Url-based solutions for transmitting Chinese characters and special dangerous characters (for reference only): During the development of urldecode and base64_encodeweb, when we need to pass Chinese characters or other URLs in the url, solutions for special dangerous characters (for reference only) urldecode, base64_encode

In the process of web development, when we need to pass Chinese characters or other special characters such as html in the url, it seems that we will always encounter various small problems, because different browsers have different codes for them. For Chinese, the general practice is:

Before passing these text strings to the url, perform urlencode ($ text) first.

However, for some "dangerous" characters, such as html characters or even SQL injection-related characters, if it is clearly passed to the system, for security reasons, the system usually filters them out.

So what if we need to keep these dangerous characters and do not filter them?

The solution I have come up with is to encode them with base64_encode ($ text) and decode them with base64_decode ($ text) on the server,

It looks perfect, but there is another problem in the use process. The base64_encode encoded string contains characters such as "/", "+", "=,

These characters are special characters in url encoding. for example, "+" indicates "space", but different browsers have different codes for "space, some are represented by "+" and some are represented by "20%". that is to say, when these base64_encode encoded strings are passed in the url and browsed in different browsers, the value obtained by the server is different.

As a result, I thought of a compromise. I first replaced these base64 encoded special characters, and then replaced them on the server:

function base_encode($str) {        $src  = array("/","+","=");        $dist = array("_a","_b","_c");        $old  = base64_encode($str);        $new  = str_replace($src,$dist,$old);        return $new;} function base_decode($str) {        $src = array("_a","_b","_c");        $dist  = array("/","+","=");        $old  = str_replace($src,$dist,$str);        $new = base64_decode($old);        return $new;}

The following figure shows the effect in the browser.

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Haha, let's see how it works...

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When developing urldecode and base64_encode web, we need to pass Chinese characters or other...