How can mb_convert_encoding be used to convert the encoding of a string from one type to another in PHP?
To convert the encoding of a string from one type to another in PHP, you can use the `mb_convert_encoding` function. This function takes the input string, the target encoding, and the source encoding as parameters and returns the converted string. Example:
```php
$inputString = "Hello, こんにちは";
$convertedString = mb_convert_encoding($inputString, 'UTF-8', 'SJIS');
echo $convertedString;
```
In this example, the input string is converted from Shift JIS encoding to UTF-8 encoding using the `mb_convert_encoding` function.