<?php

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $user_firstname = test_input($_POST["user_firstname"]);
    $user_lastname = test_input($_POST["user_lastname"]);
    $user_mail = test_input($_POST["user_mail"]);
    $user_tel = test_input($_POST["user_tel"]);
    $user_sujet = test_input($_POST["user_sujet"]);
    $user_message = test_input($_POST["user_message"]);
}

function test_input($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}

 $user_firstnameErr = $user_lastnameErr = $user_mailErr = $user_telErr = $user_sujetErr = $user_messageErr = "";
 $user_firstname = $user_lastname = $user_mail = $user_tel = $user_sujet = $user_message = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {

    if (empty($_POST["user_firstname"])) {
        $user_firstnameErr = "Firstname is required";
    }
    else {
        $user_firstname = test_input($_POST["user_firstname"]);
        if (!preg_match("/^[a-zA-Z ]*$/",$user_firstname)) {
            $user_firstnameErr = "Only letters and white space allowed";
        }
    }

    if (empty($_POST["user_lastname"])) {
        $user_lastnameErr = "Lastname is required";
    }

        else{
            $user_lastname = test_input($_POST["user_lastname"]);
            if (!preg_match("/^[a-zA-Z ]*$/",$user_lastname)) {
                $user_lastname = "Only letters and white space allowed";
            }
        }

    if (empty($_POST["user_mail"])) {
        $user_emailErr = "Email is required";
    }
        else {
            $user_email = test_input($_POST["user_mail"]);
            if (!filter_var($user_mail, FILTER_VALIDATE_EMAIL)) {
                    $user_mailErr = "Invalid email format";
                }
            }

    if (empty($_POST["user_tel"])) {
        $user_telErr = "Your phone is required";
    }
         else {
                $user_tel = test_input($_POST["user_tel"]);
             if (!preg_match("#(\+[0-9]{2}\([0-9]\))?[0-9]{10}#",$user_tel)) {
                 $user_telErr = "please enter a valid number";
             }
            }

    if (empty($_POST["user_sujet"])) {
        $user_sujetErr = "The sujet is required";
    }
        else {
            $user_sujet = test_input($_POST["user_sujet"]);
        }

    if (empty($_POST["user_message"])) {
        $user_messageErr = "Your message is required";
    }
        else {
            $user_message= test_input($_POST["user_message"]);
        }

};

if (
$user_firstname = $user_lastname = $user_mail = $user_tel = $user_sujet = $user_message != ""){

    @include("succes.php");
exit;

}