What considerations should be made when using filter_var with FILTER_VALIDATE_EMAIL in PHP to account for IDN and other limitations?

When using filter_var with FILTER_VALIDATE_EMAIL in PHP, it's important to consider that it may not fully support Internationalized Domain Names (IDN) and other limitations. To address this, you can use a more robust validation method, such as a regular expression or a dedicated library that supports IDN. 

$email = "user@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Email is valid
} else {
    // Email is not valid
}

Keywords

filter_var FILTER_VALIDATE_EMAIL IDN limitations considerations

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