Filters whether the given email exists.
$username
Sortie :
@param int|false $user_id The user ID associated with the email, @param string $email The email to check for existence. @param string $username Username. @return bool Whether username given is valid.
// Utilisation de la fonction validate_username
$result = validate_username($username);
if ($result) {
// Votre logique ici
}
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