php urlcode 有何实际用途

PHP?urlencode()?????????????,?????URL????,??????????????????????????urlencode()?????????:

1. ????:?URL??????,??????????,???????????????,??????????????,????urlencode()??????????,????????????URL?????

$keyword = "Hello World!";
$encoded_keyword = urlencode($keyword);
$url = "https://example.com/search?" . $encoded_keyword;

2. API????:???API???,?????????????,???????????????,?????????API?,????urlencode()???????????,????????????API?????

$city = "Beijing";
$encoded_city = urlencode($city);
$api_url = "https://api.weather.com/v1/weather?city=" . $encoded_city;

3. ??URL:???URL?,????urldecode()???????URL????,???????????,?????????????????URL?,????urldecode()?????????,??????????????

$encoded_url = "https://example.com/search?keyword=你好!";
$decoded_url = urldecode($encoded_url);
parse_str($decoded_url['query'], $params);

??,urlencode()?????URL???API???????URL?????????,?????????????????????????