PHP8.1의 새로운 문자열 인코딩 및 디코딩 기능

<?php
$str = "Hello, World!";
$encoded_str = base64_encode($str);
$decoded_str = base64_decode($encoded_str);

echo "原始字符串: $str
";
echo "base64编码后的字符串: $encoded_str
";
echo "base64解码后的字符串: $decoded_str
";
?>

原始字符串: Hello, World!
base64编码后的字符串: SGVsbG8sIFdvcmxkIQ==
base64解码后的字符串: Hello, World!

<?php
$url = "https://example.com/?q=PHP 8.1";
$encoded_url = urlencode($url);
$decoded_url = urldecode($encoded_url);

echo "原始URL: $url
";
echo "URL编码后的字符串: $encoded_url
";
echo "URL解码后的字符串: $decoded_url
";
?>

原始URL: https://example.com/?q=PHP 8.1
URL编码后的字符串: https%3A%2F%2Fexample.com%2F%3Fq%3DPHP+8.1
URL解码后的字符串: https://example.com/?q=PHP 8.1

<?php
$html = "<h1>Hello, PHP 8.1</h1>";
$encoded_html = htmlspecialchars($html);
$decoded_html = htmlspecialchars_decode($encoded_html);

echo "原始HTML: $html
";
echo "HTML编码后的字符串: $encoded_html
";
echo "HTML解码后的字符串: $decoded_html
";
?>

原始HTML: <h1>Hello, PHP 8.1</h1>
HTML编码后的字符串: &lt;h1&gt;Hello, PHP 8.1&lt;/h1&gt;
HTML解码后的字符串: <h1>Hello, PHP 8.1</h1>