mail.php

<?php
include "core/init.php";
protect_page();
admin_protect();
include "includes/overall/header.php";
?>

<h1>Email all users</h1>

<?php
if (isset($_GET['success']) === true && empty($_GET['success']) === true) {
?>
    <p>Email has been sent</p>
<?php
} else {
    if (empty($_POST) === false) {
//    echo 'a';
        if (empty($_POST['subject']) === true) {
            $errors[] = 'Subject is required';
        }

        if (empty($_POST['body']) === true) {
            $errors[] = 'Body is required';
        }

        if (empty($errors) === false) {
            echo output_errors($errors);
        } else {
            // send email
            // echo 'send';
            mail_users($_POST['subject'], $_POST['body']);
            header('Location: mail.php?success');
            exit();
        }
    }
    ?>

    <form action="" method="post">
        <ul>
            <li>
                Subject*:<br>
                <input type="text" name="subject">
            </li>
            <li>
                Body*:<br>
                <textarea name="body"></textarea>
            </li>
            <li>
                <input type="submit" value="Send">
            </li>
        </ul>
    </form>


    <?php
}
include "includes/overall/footer.php";
?>