How can PHP developers ensure accurate character encoding conversion when dealing with ISO-8859-1 encoded emails in PHP?

When dealing with ISO-8859-1 encoded emails in PHP, developers can ensure accurate character encoding conversion by using the `mb_convert_encoding()` function to convert the email content to UTF-8. This ensures that special characters are correctly displayed and interpreted.

// Convert ISO-8859-1 encoded email content to UTF-8
$utf8_content = mb_convert_encoding($iso_content, 'UTF-8', 'ISO-8859-1');

// Output the converted content
echo $utf8_content;