How to list pages with thumbnails, adding a "current-item" class

Question

I'm using get_pages() to create a custom navigation that lists pages with a link, title and thumbnail for each page. How can I add a "current-item" class to the item corresponding to the current page?

I'm using the following code:

<?php
    $our_pages = get_pages( array( 'sort_column' => 'menu_order' ) );
    foreach ($our_pages as $key => $page_item):
?>
    <div class="menu-item">
        <a href="<?php echo esc_url(get_permalink($page_item->ID)); ?>" class="menu-item-clicker"><span><?php echo $page_item->post_title ; ?></span></a>
        <?php echo get_the_post_thumbnail($page_item->ID,'full'); ?>
    </div>
<?php endforeach; ?>

The following does not display the class, but to illustrate what I'm trying to do, here's the conditional I tried, with no success:

<?php
    $our_pages = get_pages( array( 'sort_column' => 'menu_order' ) );
    foreach ($our_pages as $key => $page_item) :
        if($page->ID == $page_item->ID) {
            $class = 'current-item';
        }
?>
    <div class="menu-item <?php echo $class; ?>">
        <a href="<?php echo esc_url(get_permalink($page_item->ID)); ?>" class="menu-item-clicker"><span><?php echo $page_item->post_title ; ?></span></a>
        <?php echo get_the_post_thumbnail($page_item->ID,'full'); ?>
    </div>
<?php endforeach; ?>

Looking forward to your input!

Answer 1

By $page->ID, I guess you're trying to fetch ID of the current page, right? If so, that's incorrect. Page itself is a post type so you need to get the ID through $post->ID and make sure $post is accessible otherwise use get_the_ID() to return ID of the current post/page.

Final code:

<?php

$our_pages = get_pages( array( 'sort_column' => 'menu_order' ) );
foreach ($our_pages as $key => $page_item) :
    $class = '';
    if($post->ID == $page_item->ID)
        $class = 'current-item';

?>
    <div class="menu-item <?php echo $class; ?>">
        <a href="<?php echo esc_url(get_permalink($page_item->ID)); ?>" class="menu-item-clicker">
            <span><?php echo $page_item->post_title ; ?></span>
        </a>
        <?php echo get_the_post_thumbnail($page_item->ID,'full'); ?>
    </div>
<?php endforeach; ?>

Answer 2

Just an additional info regarding the answer from @Junaid Ahmed:

You might add this before calling $post->ID:

global $post;