防止链接在 PHP 中被双重编码

Question

I have the following URL in a MySQL database for a PHP application - part of our system allows a user to edit their previous post with these links and save - however as the url gets encoded again when a user edits this is then breaks the url as下面显示。

是否有一种简单的方法或现有的 PHP function 来确定字符串是否已经被编码并更改字符串以删除不需要的字符，使其保留在下面的预期 Z78E6221F6393D1356681DB398F14CED 中。

Expected output url: https://r5uy4lmtdqka6a1rzyexlusfl-902rjcrzfe6k93co7a644-tom.s3.eu-west-2.amazonaws.com/Carbon%20Monoxide/Summer%20CO%20Campaign/CO%20Summer%202022/CO%20Summer%20you%20can% 20smell%20the%20BBQ%20-%20600x600.jpg

Actual output url: https://r5uy4lmtdqka6a1rzyexlusfl-902rjcrzfe6k93co7a644-tom.s3.eu-west-2.amazonaws.com/Carbon%2520Monoxide/Summer%2520CO%2520Campaign/CO%2520Summer%25202022/CO%2520Summer%2520you%2520can% 2520smell%2520the%2520BBQ%2520-%2520600x600.jpg

Answer 1

正如评论中所建议的，双重解码，然后编码（仅查询字符串部分）。

<?php
$str = "https://r5uy4lmtdqka6a1rzyexlusfl-902rjcrzfe6k93co7a644-tom.s3.eu-west-2.amazonaws.com/Carbon%2520Monoxide/Summer%2520CO%2520Campaign/CO%2520Summer%25202022/CO%2520Summer%2520you%2520can%2520smell%2520the%2520BBQ%2520-%2520600x600.jpg";
$str = "https://r5uy4lmtdqka6a1rzyexlusfl-902rjcrzfe6k93co7a644-tom.s3.eu-west-2.amazonaws.com/Carbon%20Monoxide/Summer%20CO%20Campaign/CO%20Summer%202022/CO%20Summer%20you%20can%20smell%20the%20BBQ%20-%20600x600.jpg";

function fix_url($str)
{
    $arr = explode('/', $str, 4);
    $qs = $arr[3]; // add if at all check?

    while (true) {
        $decoded = urldecode($qs);
        if ($decoded == $qs) {
            break;
        }
        $qs = $decoded;
    }
    $encoded = urlencode($decoded);
    $result = $arr[0] . '//' . $arr[2] . $encoded;
    return $result;
}

echo fix_url($str);