class-post-meta-inspector.php

<?php
/**
 * Main plugin container
 *
 * @package post-meta-inspector
 */

/**
 * Post Meta Inspector
 */
class Post_Meta_Inspector {

	/**
	 * Post_Meta_Inspector class
	 *
	 * @var object
	 */
	private static $instance;

	/**
	 * Does user have the cap to view post meta?
	 *
	 * @var bool
	 */
	public $view_cap;

	/**
	 * Kick off the instance.
	 *
	 * @return object
	 */
	public static function instance() {
		if ( ! isset( self::$instance ) ) {
			self::$instance = new Post_Meta_Inspector();
			self::setup_actions();
		}
		return self::$instance;
	}

	/**
	 * Constructor
	 */
	private function __construct() {
		/** Do nothing */
	}

	/**
	 * Setup on init, add the metaboxes
	 *
	 * @return void
	 */
	private static function setup_actions() {
		add_action( 'init', array( self::$instance, 'action_init' ) );
		add_action( 'add_meta_boxes', array( self::$instance, 'action_add_meta_boxes' ) );
	}

	/**
	 * Init i18n files
	 */
	public function action_init() {
		load_plugin_textdomain( 'post-meta-inspector', false, plugin_basename( dirname( __FILE__ ) ) . '/languages/' );
	}

	/**
	 * Add the post meta box to view post meta if the user has permissions to
	 */
	public function action_add_meta_boxes() {
		$post_type      = get_post_type();
		$this->view_cap = apply_filters( 'pmi_view_cap', 'manage_options' );

		if ( empty( $post_type ) || ! current_user_can( $this->view_cap ) || ! apply_filters( 'pmi_show_post_type', '__return_true', $post_type ) ) {
			return;
		}

		add_meta_box( 'post-meta-inspector', __( 'Post Meta Inspector', 'post-meta-inspector' ), array( self::$instance, 'post_meta_inspector' ), get_post_type() );
	}

	/**
	 * Output the post meta in metabox.
	 *
	 * @return void
	 */
	public function post_meta_inspector() {
		$toggle_length = apply_filters( 'pmi_toggle_long_value_length', 0 );
		$toggle_length = max( intval( $toggle_length ), 0 );
		$toggle_el     = '<a href="javascript:void(0);" class="pmi_toggle">' . esc_html__( 'Click to show&hellip;', 'post-meta-inspector' ) . '</a>';
		?>
		<style>
			#post-meta-inspector table {
				text-align: left;
				width: 100%;
			}
			#post-meta-inspector table .key-column {
				display: inline-block;
				width: 20%;
			}
			#post-meta-inspector table .value-column {
				display: inline-block;
				width: 79%;
			}
			#post-meta-inspector code {
				word-wrap: break-word;
			}
		</style>

		<?php $custom_fields = get_post_meta( get_the_ID() ); ?>
		<table>
			<thead>
				<tr>
					<th class="key-column"><?php esc_html_e( 'Key', 'post-meta-inspector' ); ?></th>
					<th class="value-column"><?php esc_html_e( 'Value', 'post-meta-inspector' ); ?></th>
				</tr>
			</thead>
			<tbody>
		<?php
		foreach ( $custom_fields as $key => $values ) :
			if ( apply_filters( 'pmi_ignore_post_meta_key', false, $key ) ) {
				continue;
			}
			?>
			<?php foreach ( $values as $value ) : ?>
				<?php
				$value   = var_export( $value, true ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_var_export
				$toggled = $toggle_length && strlen( $value ) > $toggle_length;
				?>
			<tr>
				<td class="key-column"><?php echo esc_html( $key ); ?></td>
				<td class="value-column">
				<?php
				if ( $toggled ) {
					echo $toggle_el; // phpcs:ignore -- escaped earlier
				}
				?>
				<code
				<?php
				if ( $toggled ) {
					echo ' style="display: none;"';
				}
				?>
				>
					<?php echo esc_html( $value ); ?>
				</code>
				</td>
			</tr>
			<?php endforeach; ?>
		<?php endforeach; ?>
			</tbody>
		</table>
		<script>
		jQuery(document).ready(function() {
			jQuery('.pmi_toggle').click( function(e){
				jQuery('+ code', this).show();
				jQuery(this).hide();
			});
		});
		</script>
		<?php
	}

}