Untitled

<!DOCTYPE html>
<html  lang="fr">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" type="text/css" href="">
    <title></title>
</head>
<body>


    <?php

    // define variables and set to empty values
    $errors = array();

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

        if (empty($_POST["lastName"])) {
            $errors['lastNameErr'] = "Last Name is required";
        }

        if (empty($_POST["firstName"])) {
            $errors['firstNameErr']= "First Name is required";
        }

        if (empty($_POST["email"])) {
            $errors['emailErr'] = "Email is required";}
        else {
            if (!filter_var($_POST["email"], FILTER_VALIDATE_EMAIL)) {
                $errors['emailErr']  = "Invalid email format";
            }
        }

        if (empty($_POST["tel"])) {
            $errors['telErr']  = "Tel is required";
        }

        if (empty($_POST["select"])) {
            $errors['selectErr']  = "Select is required";
        }

        if (count($errors) == 0){
            header("Location:page.php");
            exit;
        }

    }


    ?>
    <form method="post" action="">
<div>
    <label for="lastName">LastName :</label>
    <input type="text" id="lastName" name="lastName" />
    <span class="error">*<?php if(isset($errors['lastNameErr'])) echo $errors['lastNameErr'];?></span>
    <br><br>
        <div>

            <div>
                <label for="firstName">FirstName :</label>
                <input type="text" id="firstName" name="firstName" />
                <span class="error">* <?php if(isset($errors['firstNameErr'])) echo $errors['firstNameErr'];?></span>
                <br><br>
                <div>

            <div>
                <label for="email">Courriel :</label>
                <input type="text" id="email" name="email" />
                <span class="error">* <?php if(isset($errors['emailErr'])) echo $errors['emailErr'];?></span>
                <br><br>
            </div>

            <div>
                <label for="select">Choose a day:</label>
                <select id="select" name="select">
                    <option value="">--Please choose an option--</option>
                    <option value="Monday">Monday</option>
                    <option value="Tuesday">Tuesday</option>
                    <option value="Wednesday">Wednesday</option>
                    <option value="Thursday">Thursday</option>
                    <option value="Friday">Friday</option>
                    <option value="Saturday">Saturday</option>
                    <option value="Sunday">Sunday</option>
                </select>
                <span class="error">* <?php if(isset($errors['selectErr'])) echo $errors['selectErr'];?></span>
                <br><br>
            </div>

            <div>
                <label for="phone">Tel :</label>
                <input type="tel" id="phone" name="tel" >
                <span class="error">* <?php if(isset($errors['telErr'])) echo $errors['telErr'];?></span>
                <br><br>
            </div>

            <div>
                <label for="msg">Message:</label>
                <textarea id="msg" name="message"></textarea>
            </div>

            <div class="button">
                <button type="submit">Envoyer un message</button>
            </div>
</form>
</body>