<?php

session_start();
include('connection.php');

$missinguser ='<p>please try again username</p>';
$missingemail='<p>please tr again email</p>';
$invalidgemail='<p>bad email</p>';
$missingpasswordr='<p>please try again password</p>';
$invalidpasswordr='<p>bad password</p>';
$differentpasswordr='<p>different password</p>';
$missingpassword2='<p>forget password ?</p>';

if(empty($_POST["username"]))
{
        $errors .= $missinguser;
}else
{
    $username = filter_var($_POST["username"], FILTER_SANITIZE_STRING);
}

if(empty($_POST["email"]))
{
     echo $errors .=$missingemail;
}else
{
    $email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);
    if(filter_var($email,FILTER_VALIDATE_EMAIL)){
                $errors .=$invalidgemail;
    }
}

if(empty($_POST["password"]))
{
        $errors .=$missingpasswordr;
}else if(!(strlen($POST["password"])>6
         and preg_match('/[A-Z]/',$_POST["password"])
         and preg_match('/[0-9]/',$_POST["password"])
           )
         ){
    $errors .= $invalidpasswordr;
}else{
    $password = filter_var($_POST["password2"], FILTER_SANITIZE_STRING);
    if(empty($POST["password"])){
            $errors .= $missingpassword2;
    }else
       {
              $password2 = filter_var($_POST["password2"], FILTER_SANITIZE_STRING);
                if($password!==$password2)
                {
                     $errors .= $differentpasswordr;
                }
       }
}
if($errors){
    $resultmessage = '<div class="alert alert-danger">'.$errors.'</div>';
    echo $resultmessage;
}

$username = mysqli_real_escape_string($link,$username);
$email = mysqli_real_escape_string($link,$email);
$password = mysqli_real_escape_string($link,$password);
$password2 = mysqli_real_escape_string($link,$password2);