Post Shortcodes

// Est. Reading Time

$reading_speed = 200; // 200 words per minute

$content       = get_post_field( 'post_content', get_the_id() );

$word_count    = str_word_count( strip_tags( $content ) );

$reading_time  = ceil( $word_count / $reading_speed );

function post_read_time_shortcode($atts) {

echo '<p>Estimated reading time: ' . absint( $reading_time ) . ' ' . _n( 'minute', 'minutes', $reading_time ) . '</p>';

}

add_shortcode('read_time', 'post_read_time_shortcode');

// Breadcrumbs

global $post;

function breadcrumbs_shortcode {

	if ( ! is_home() ) {

		echo '<div class="breadcrumbs">';

		echo '<a href="' . esc_url( site_url() ) . '">Home</a> / ';

		if ( is_category() || is_single() ) {

			the_category( ' / ' );

			if ( is_single() ) {

				echo ' / ';

				the_title();

			}

		} elseif ( is_page() ) {

			if ( $post->post_parent ) {

				$anc        = get_post_ancestors( $post->ID );

				$page_title = get_the_title();

				foreach ( $anc as $ancestor ) {

					echo '<a href="' . esc_url( get_permalink( $ancestor ) ) . '" title="' . esc_attr( get_the_title( $ancestor ) ) . '">' . esc_html( get_the_title( $ancestor ) ) . '</a> / ';

				}

				echo esc_html( $page_title );

			} else {

				echo '<strong> ' . esc_html( get_the_title() ) . '</strong>';

			}

		}

		echo '</div>';

	}

}

add_shortcode('breadcrumbs', 'breadcrumbs_shortcode');

// Related Posts by Category

function related_posts_shortcode {

if ( ! empty( $post ) ) {

	$categories = get_the_category( $post->ID );

	if ( $categories ) {

		$category_ids = array();

		foreach ( $categories as $category ) {

			$category_ids[] = $category->term_id;

		}

		$query_args = array(

			'category__in'   => $category_ids,

			'post__not_in'   => array( $post->ID ),

			'posts_per_page' => 5

		);

		$related_posts = new WP_Query( $query_args );

		if ( $related_posts->have_posts() ) {

			echo '<div class="related-posts">';

			echo '<h3>Related Posts</h3><ul>';

			while ( $related_posts->have_posts() ) : $related_posts->the_post();

				echo '<li><a href="' . get_permalink() . '">' . get_the_title() . '</a></li>';

			endwhile;

			echo '</ul>';

			echo '</div>';

			wp_reset_postdata();

		}

	}

}}

add_shortcode('related_posts', 'related_posts_shortcode');

// Meta boxes 

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() );

} );