php转义字符在URL编码中如何应用

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

$string = "Hello World! 123";
$encoded_string = urlencode($string);
echo $encoded_string; // ??: "Hello World! 123"

??????,?????? ,???????!,???????

???URL????????,????urlencode()??????????,????????????URL??????????URL?,????urldecode()?????????,????????:

// ??????URL?? 'name',??? 'John Doe'
$name = 'John Doe';
$encoded_name = urlencode($name); // ??: 'John Doe'

// ??????????URL?
$url = 'https://example.com/page.php?name=' . $encoded_name;
echo $url; // ??: 'https://example.com/page.php?name=John Doe'

// ????????URL?,??urldecode()??????
$decoded_name = urldecode($encoded_name); // ??: 'John Doe'

??,?????URL?????????????????