This is how you would switch the image container position in a PHP foreach loop using WordPress.

Switch image container position in PHP - (WordPress) foreach loop

<div class="container-fluid no-padding hidden-xs">
        <?php foreach (get_posts(['post_type' => 'home_project_section', 'posts_per_page'=>100]) as $key => $homeProjects) {
            $thumb_id = get_post_thumbnail_id($homeProjects);
            $thumb_url_array = wp_get_attachment_image_src($thumb_id, 'thumbnail-size', true);
            $thumb_url = $thumb_url_array[0];
            $website_url = '/projects/';
            $url_to_project = $website_url . $homeProjects->post_name;
        ?>
            <?php if($key % 2 == 0) { ?>
                <div class="col-xs-12 no-padding">
                    <div class="col-sm-7 col-md-6 home-projects-project-container">
                        <h1 class="home-projects-header">
                            <?= $homeProjects->post_title ?>
                        </h1>
                        <p class="home-projects-description">
                            <?= $homeProjects->post_content ?>
                        </p>
                        <br />
                        <a href="<?= $url_to_project; ?>" class="btn btn-primary btn-light-blue">
                            View Case Study
                        </a>
                    </div>
                    <div class="col-sm-5 col-md-6 no-padding">
                        <div style="background: url('<?= $thumb_url; ?>') center center; background-size: cover;" class="home-projects-image"></div>
                    </div>
                </div>
            <?php } else { ?>
                <div class="col-xs-12 no-padding">
                    <div class="col-sm-5 col-md-6 no-padding">
                        <div style="background: url('<?= $thumb_url; ?>') center center; background-size: cover;" class="home-projects-image"></div>
                    </div>
                    <div class="col-sm-7 col-md-6 home-projects-project-container">
                        <h1 class="home-projects-header">
                            <?= $homeProjects->post_title ?>
                        </h1>
                        <p class="home-projects-description">
                            <?= $homeProjects->post_content ?>
                        </p>
                        <br />
                        <a href="<?= $url_to_project; ?>" class="btn btn-primary btn-light-blue">
                            View Case Study
                        </a>
                    </div>
                </div>
            <?php } ?>
        <?php } ?>
    </div>