Here php code
define('SITE_NAME','example');
define('SITE_EMAIL_ID','abc@exampl.com');
function sendmail($to, $subject="Mail from ".SITE_NAME, $message=null, $from=SITE_EMAIL_ID, $bcc=null, $cc=null)
{
.....
}
shows error Parse error: syntax error, unexpected '.', expecting ')' in functions.php on line 4