_form.php

<div class="container">
    <div class="card">
        <div class="card-header">
        <h3>
            <?php if ($user['id']): ?>
                <b>Update user:</b> <?php echo $user['name'] ?>
            <?php else : ?>
                <b>Create user:</b>
            <?php endif; ?>
        </h3>
        </div>
        <div class="card-body">
            <form action="" method="POST" enctype="multipart/form-data">
                <div class="form-group">
                    <label>Name</label>
                    <input name="name" value="<?php echo $user['name'] ?>" class="form-control <?php echo $errors['name'] ? 'is-invalid' : '' ?>">
                    <div class="invalid-feedback">
                        <?php echo $errors['name'] ?>
                    </div>
                </div>
                <div class="form-group">
                    <label>Username</label>
                    <input name="username" value="<?php echo $user['username'] ?>" class="form-control <?php echo $errors['username'] ? 'is-invalid' : '' ?>">
                    <div class="invalid-feedback">
                        <?php echo $errors['username'] ?>
                    </div>
                </div>
                <div class="form-group">
                    <label>email</label>
                    <input name="email" value="<?php echo $user['email'] ?>" class="form-control <?php echo $errors['email'] ? 'is-invalid' : '' ?>">
                    <div class="invalid-feedback">
                        <?php echo $errors['email'] ?>
                    </div>
                </div>
                <div class="form-group">
                    <label>Website</label>
                    <input name="website" value="<?php echo $user['website'] ?>" class="form-control">
                </div>
                <div class="form-group">
                    <label>Image</label>
                    <input name="picture" type="file" class="form-control-file">
                </div>

                <button class="btn btn-success">Submit</button>
                <a href="index.php" class="btn btn-secondary">Cancel</a>
            </form>
        </div>
    </div>
</div>