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<?php $thumb = wp_get_attachment_image_src( get_post_thumbnail_id( wc_get_page_id( 'shop' ) ), 'full' );?>

    <header style="background-image: url('<?php echo $thumb['0']; ?>')" class="inner-page-header">
        <div class="wrap">
            <div class="page_header">
                <?php the_title(); ?>
            </div>
        </div>
    </header>