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How to display the title and thumbnail of child Custom Post Types in WordPress


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How to display the title and thumbnail of child Custom Post Types on the parent custom post type in WordPress:

<?php
$pageChildren = get_pages('child_of='.$post->ID."&echo=0&post_type=custompostypename");
if ( $pageChildren ) {
foreach ( $pageChildren as $pageChild ) {
echo '<a href="' . get_permalink($pageChild->ID) . '">';
$childimage = wp_get_attachment_image_src(get_post_thumbnail_id($pageChild->ID), 'thumbnail_size');
$childimagealttext = get_post_meta(get_post_thumbnail_id($pageChild->ID), '_wp_attachment_image_alt', true);
echo '<img src="'. $childimage['0'] . '" alt="' . $childimagealttext . '"/></a>';
echo '<p><a href="' . get_permalink($pageChild->ID) . '">'. $pageChild->post_title.'</a></p>';
}
}
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