add_action( 'add_meta_boxes', function () {

	if ( ! current_user_can( 'manage_options' ) ) {

		// Don't display the metabox to users who can't manage options

		return;

	}

	add_meta_box( 'wpcode-view-post-meta', 'Post Meta', function () {

		$custom_fields = get_post_meta( get_the_ID() );

		?>

		<table style="width: 100%; text-align: left;">

			<thead>

			<tr>

				<th style="width: 28%">Meta Key</th>

				<th style="width: 70%">Value</th>

			</tr>

			</thead>

			<tbody>

			<?php foreach ( $custom_fields as $key => $values ) {

				?>

				<?php foreach ( $values as $value ) { ?>

					<tr>

						<td><?php echo esc_html( $key ); ?></td>

						<td><code><?php echo esc_html( $value ); ?></code></td>

					</tr>

				<?php } ?>

			<?php } ?>

			</tbody>

		</table>

		<?php

	}, get_post_type() );

} );