That’s all well and dandy, but when someone copy and pastes the e-mail address, it will be backwards still :)

in case anyone else is interested:

function cProtect($text)
{
//protect the contact info by reversing phone number and email, and then re-reverse it again via css
$phone = get_phone($text);
$email = get_email($text);
$revphone = str_mirror($phone);
$revemail = str_mirror($email);

$text = str_replace($phone, $revphone, $text);
$text = str_replace($email, $revemail, $text);
return $text;
}

function str_mirror($string)
{
$res = strrev($string);
$res = ''.$res.'';
return $res;
}

function get_phone($string)
{
$regex = '/\(?([0-9]{2,4})\)?[-. ]?([0-9]{2,4})[-. ]?([0-9]{2,4})[-. ]?(([0-9]{2,4}))?[-. ]?([0-9]{2,4})?[-. ]?/is';
preg_match($regex, $string, $match);
if(isset($match[0]))
{
return $match[0];
}
return false;
}

function get_email($string)
{
$regex = "/([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})/is";
preg_match($regex, $string, $match);
if(isset($match[0]))
{
return $match[0];
}
return false;
}

$text = "please call at 123 456 789, or email me at test@example.com";

echo cProtect($text);

Result:

please call at 987 654 321, or email me at moc.elpmaxe@tset