email - Mail function is not working in PHP

mail($to, "Subject: $subject",$message );
echo "Thank you for using our mail form";

instead of this ,first check if the mail is sent

$mail=mail($to, "Subject: $subject",$message );
if($mail){
  echo "Thank you for using our mail form";
}else{
  echo "Mail sending failed.";
}

By this actually u can know whether your mail function in working or not

if it is not working.the problem can be with SMTP settings in your localhost

enable errors in php if not enabled using

ini_set('display_errors',1);