php - wordpress - proper foreach in array syntax -

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i'm still novice @ php appreciated. i'm using custom menu display 4 posts, , each post i'd post thumbnail. code below, gives me invalid argument supplied error.

    <div id="stampnav">     <?php $pages = wp_nav_menu( array( 'container_class' => 'menu-header','theme_location' => 'stamp-menu' ) );      foreach($pages $pagg) {      echo get_the_post_thumbnail($pagg->id, 'thumbnail'); }     ?>     </div>

you need call global $post , make query post thumbnail menu not return meta associated page, queries built in "menu" custom post type.

your other option create custom walker class nav menu.


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