Come fare per evitare che gli spider trovino gli indirizzi email che inseriamo nelle pagina web ?
Un'ottima soluzione è sostituire i caratteri con i corrispondenti codici html.
il codice html per linkare la mail user@dominio.it, sostituendo per esempio il carattere "@" con il corrispondente codice html "@", diventa:
<a xhref="mailto:@dominio.it>user@dominio.it"</a>
Possiamo crearci una funzione php che trasforma tutti i caratteri componenti l'indirizzo in codice html. Oppure, per semplicità e per creare ancora più confusione agli spider, possiamo trasformare solo alcuni caratteri (ne basta uno per rendere l'indirizzo mail diverso). Suggerisco di trasformare solo le vocali e la chiocciola, visto che compaiono sparsi in tutti gli indirizzi mail.
ecco la funzione:
function mailmask($email)
{
$sostituzioni = array('a' => 'a',
'e' => 'e',
'i' => 'i',
'o' => 'o',
'u' => 'u',
'@' => '@'
);
foreach($sostituzioni as $search=>$replace)
$email = str_replace($search, $replace , $email); return $email;
}
esempio di utilizzo:
<a xhref="maito:<?=mailmask("user@dominio.it")?>"><?=mailmask("user@dominio.it")?></a>
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