Display Featured Image Meta

featured-image-meta

<?php

/**
 * Adds a checkbox to the featured image metabox.
 *
 * @param string $content
 */
 
function prefix_featured_image_meta( $content ) {
	global $post;
	$text = __( 'Don\'t display image in post.', 'prefix' );
	$id = 'hide_featured_image';
	$value = esc_attr( get_post_meta( $post->ID, $id, true ) );
    $label = '<label for="' . $id . '" class="selectit"><input name="' . $id . '" type="checkbox" id="' . $id . '" value="' . $value . ' "'. checked( $value, 1, false) .'> ' . $text .'</label>';
    return $content .= $label;
}
add_filter( 'admin_post_thumbnail_html', 'prefix_featured_image_meta' );

/**
 * Save featured image meta data when saved
 *
 * @param int $post_id The ID of the post.
 * @param post $post the post.
 */
function prefix_save_featured_image_meta( $post_id, $post, $update ) {

    $value = 0;
    if ( isset( $_REQUEST['hide_featured_image'] ) ) {
        $value = 1;
    }

	// Set meta value to either 1 or 0
    update_post_meta( $post_id, 'hide_featured_image', $value );

}
add_action( 'save_post', 'prefix_save_featured_image_meta', 10, 3 );

?>