How can PHP functions like urldecode, base64_decode, and quoted_printable_decode be used to handle encoded strings in PHP?

Encoded strings in PHP can be decoded using functions like urldecode, base64_decode, and quoted_printable_decode. These functions help in converting encoded data back to its original form, making it readable and usable in your PHP application. To decode an encoded string, simply pass the encoded string as an argument to the respective decoding function.

```php
$encoded_url = "https%3A%2F%2Fwww.example.com%2F";
$decoded_url = urldecode($encoded_url);
echo $decoded_url;
```

This code snippet decodes a URL-encoded string using the urldecode function and then prints the decoded URL.