How can PHP developers ensure compatibility with different email clients when using Umlauts in domain names?

To ensure compatibility with different email clients when using Umlauts in domain names, PHP developers can use the `idn_to_ascii` function to convert the domain name to its ASCII representation. This will help avoid any encoding issues that may arise when sending emails to clients that do not support non-ASCII characters in domain names. 

$email = "user@example.com";
list($user, $domain) = explode('@', $email);
$domain = idn_to_ascii($domain);
$newEmail = $user . '@' . $domain;
echo $newEmail;

Keywords

PHP email clients Umlauts domain names compatibility

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