Suggestion to add variable type check

Hi!

Thanks for the plugin.
I’m using your plugin with Advanced Custom Fields and have added a filter to encode emails in custom fields as well. It’s working, however, ACF has a field type called Relationships that is an array. Function eae_encode_emails expects strings and throws an error. Would you like to add a type check into that function?

Something like:

if ( gettype($string) != 'string' ) {
    return 0;
}

https://wordpress.org/plugins/email-address-encoder/