Check the registration field

Question

Is there any way to force in my registration form only use gmail?

            if(filter_var($post_email, FILTER_VALIDATE_EMAIL)){
            if(strlen($post_password) >= 8){
                if(!preg_match('/[\'^£$%&*()}{ @#~?><>,|=_+¬-]/', $post_login)){
                    if(!player_exist_login($post_login) && !player_exist_email2($post_email)){
                        if(player_create($post_login,$post_email,$post_password,$post_chardeletecode)){
                            if(player_send_email_register($post_login,$post_email,$post_password,$post_chardeletecode)){
                                promo_code($promocode);
                                r('verify/');
                            }else{
                                $check_msg = l(170);
                            }
                        }else{
                            $check_msg = l(84);
                        }
                    }else{
                        $check_msg = l(83);
                    }
                }else{
                    $check_msg = l(81);
                }
            }else{
                $check_msg = l(80);
            }
        }else{
            $check_msg = l(79);
        }

Answer 1

Use a regular expression pattern:

"/@gmail.com$/i"

In practice:

<?php
if (!preg_match("/@gmail\.com$/i", $endereco_email))
{
// Nao tem @gmail.com
}
?>

Learn more about regular expressions.

I don’t know where the email is tested, but I inserted it into the sending function, check:

<?php
function player_create($a,$b,$c,$d){
 return true;
}
function player_exist_login($a){
 return true;
}
function l($a){
 return true;
}

if(player_send_email_register("asdasdasdasdasdasdasd","[email protected]","asdasdasdasdasdasdasd","UTF-8")){

  if (!preg_match("/@gmail\.com$/i", "[email protected]"))
  {
    echo "nao tem";
    exit();
  }
    else {
    echo "tem";
  }

}

?>