<!DOCTYPE html>
<html>
<body>
<?php
$str = "Hello world!";
// 对字符串进行编码
$encodeString = convert_uuencode($str);
echo $encodeString . "<br>";
// 对字符串进行解码
$decodeString = convert_uudecode($encodeString);
echo $decodeString;
?>
</body>
</html>