<?php

$de_brochure = ('https://ruta/de-brochure.pdf');
$en_brochure = ('https://ruta/en-brochure.pdf');
$es_brochure = ('https://ruta/es-brochure.pdf');
$country_code = 'ES'; // Normally I get this code from a form.
$brochure = array ( $de_brochure, $en_brochure, $es_brochure );
$brochure_link = '';

if ( $country_code == 'ES' ) {

$to = '[email protected]';
$subject = 'Ejemplo';
$txt = 'El dossier a enviar es' . $brochure_link[$brochure];
$headers = 'De: [email protected]' . 'rn' .
'CC: [email protected]';

mail ($to, $subject, $txt, $headers );

}

else {

    echo $country_code . 'no es el código de españa';

}