URL Pass Chinese character, special dangerous character solution (for reference only) UrlDecode, base64

In the process of web development, when we need to pass in the URL of the Chinese character or other special characters such as HTML, it always seems to encounter a variety of small problems, because different browsers for their coding is not the same. For Chinese, the general practice is:

Before passing these text strings to the URL, UrlEncode ($text) is done first.

But for some very "dangerous" characters, such as HTML characters, or even SQL injection-related characters, if it is clearly passed to the system, the system will generally filter them out for security reasons.

So, what if we need to keep these dangerous characters and not be filtered?

My idea is to encode them Base64_encode ($text) First and then decode them Base64_decode ($text) to the server.

Seemingly perfect, but in the process of using a problem, Base64_encode encoded string contains "/", "+", "=" and other characters,

These characters in the URL encoding is a special character, such as "+", it means "space", but different browsers to "space" coding is not the same, some use "+" said, some use "20%" said, that is, let these base64_ The encode encoded string is passed in the URL, and the server gets a different value when browsing through the browser.

Thus, the idea of a compromise, the first of these Base64 encoded special characters replaced, to the service side, and then replaced back:

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 are the effects you get in the browser

Xoo6w6osuf65_aiy_atl_b00ke5_b8jnus6ho6gjoam_c

Oh, see how the effect ...

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