Build a dashboard menu with a help tab to see different ways to get levels using Paid Memberships Pro.

pmpro-primer-levels-sample.php

<?php // Don't include in Customizations plugin
/**
 * Plugin Name: PMPro Primer
 * Description: A dashboard menu, `pmpro_primer_page`, with some helpful PMPro functions.
 * Author: pbrocks
 * Version: 1.0.1
 * Text-Domain: pmpro-primer-menu
 */
/**
 * Add a page to the primer menu.
 *
 * @since 1.0.0
 *
 * @return array
 */
add_action( 'admin_menu', 'pmpro_primer' );
function pmpro_primer() {
	global $this_menu_slug;
	$this_menu_slug = preg_replace( '/_+/', '-', __FUNCTION__ );
	$label = ucwords( preg_replace( '/_+/', ' ', __FUNCTION__ ) );
	$pmpro_primer_screen = add_dashboard_page( __( $label, 'pmpro-primer-menu' ), __( $label, 'pmpro-primer-menu' ), 'manage_options', $this_menu_slug . '.php', 'pmpro_primer_page' );
	// Adds my_help_tab when primer_page loads
	add_action( 'load-' . $pmpro_primer_screen, 'add_primer_help_tab' );
}

function add_primer_help_tab() {
	$screen = get_current_screen();
	$help_1_id = 'using_pmpro_array';
	$help_1_title = ucwords( preg_replace( '/_+/', ' ', $help_1_id ) );
	$sample_output = get_sample_pmpro_levels_code();
	$sample_description = 'This is a quick sample of what you can do with the code on this page. Copy and paste this into your code to see how it works.';
	$screen->add_help_tab(
		array(
			'id'    => $help_1_id,
			'title' => __( $help_1_title ),
			'content'   => '<h4>' . __( $help_1_title ) . '</h4>' .
			'<p class="description">' . esc_html( $sample_description ) .
			'</p>' .
			'<xmp>
$array = get_pmpro_levels_array();
foreach ( $array as $key => $value ) {
	echo \'Level \' . $value[\'id\'] . \' is \' . $value[\'name\'] . \' costs $\' . $value[\'billing_amount\'] . \' <br> \';
}
	</xmp>
	' . 'Returns this: <p>' . $sample_output . '</p>',
		)
	);
	$screen->add_help_tab(
		array(
			'id'    => 'primer_help_2',
			'title' => __( 'Primer Help 2' ),
			'content'   => '<p>' . __( 'Descriptive content that will show in My Help Tab-body goes here.' ) . '</p>',
		)
	);
	$screen->add_help_tab(
		array(
			'id'    => 'primer_help_3',
			'title' => __( 'Primer Help 3' ),
			'content'   => '<p>' . __( 'Descriptive content that will show in My Help Tab-body goes here.' ) . '</p>',
		)
	);
}

/**
 * Debug Information
 *
 * @since 1.0.0
 *
 * @param bool $html Optional. Return as HTML or not
 *
 * @return
 */
function pmpro_primer_page() {
	global $level, $pmpro_levels;
	echo '<div class="wrap">';
	echo '<h2>' . ucwords( preg_replace( '/_+/', ' ', __FUNCTION__ ) ) . '</h2>';
	$screen = get_current_screen();
	echo '<h4>get_pmpro_levels_object()</h4>';
	echo '<pre>';
	print_r( get_pmpro_levels_object() );
	echo '</pre>';

	echo '<h4>get_pmpro_levels_array()</h4>';
	echo '<pre>';
	print_r( get_pmpro_levels_array() );
	echo '</pre>';

	echo '<h4>get_pmpro_levels_shortlist()</h4>';
	echo '<pre>';
	print_r( get_pmpro_levels_shortlist() );
	echo '</pre>';

	$array = get_pmpro_levels_array();
	foreach ( $array as $key => $value ) {
		echo 'Level ' . $value['id'] . ' is ' . $value['name'] . ' costs $' . $value['billing_amount'] . '<br>';
	}

	$this_plugin = get_plugin_data( __FILE__ );
	echo '<h4>This plugin is ' . sprintf(
		__( '%1$s, version %2$s, is %3$s.', 'pmpro-primer-menu' ),
		$this_plugin['Name'],
		$this_plugin['Version'],
		$this_plugin['Description']
	) . '</h4>';
	// $pmprolevels = the_pmpro_levels_array( $pmpro_levels );
	echo 'Plugin info $level <pre>';
	print_r( $level );
	echo '</pre>';

	echo '</div>';
}
/**
 * Description
 *
 * @return object
 */
function get_pmpro_levels_object() {
	global $wpdb;
	$existing_levels = $wpdb->get_results(
		"
		SELECT * FROM $wpdb->pmpro_membership_levels
		"
	);
	return $existing_levels;
}


/**
 * Description
 *
 * @return array
 */
function get_pmpro_levels_array() {
	$existing_levels = get_pmpro_levels_object();
	foreach ( $existing_levels as $level_key => $level_value ) {
		foreach ( $level_value as $key => $value ) {
			$pmpro_level_list[ $level_key ][ $key ] = $value;
		}
	}
	return $pmpro_level_list;
}

function get_sample_pmpro_levels_code() {
	$array = get_pmpro_levels_array();
	foreach ( $array as $key => $value ) {
		$sample .= 'Level ' . $value['id'] . ' is ' . $value['name'] . ' costs $' . $value['billing_amount'] . '<br>';
	}
	return $sample;
}

/**
 * Description
 *
 * @return string
 */
function get_pmpro_levels_shortlist() {
	$existing_levels = get_pmpro_levels_object();
	$pmpro_level_list = '<ul>';
	foreach ( $existing_levels as $key => $value ) {
		$pmpro_level_list .= '<li>Level ' . $value->id . ' => ' . $value->name . '</li>';
	}
	$pmpro_level_list .= '<ul>';
	return $pmpro_level_list;
}

add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), 'pmpro_primer_action_links' );
/**
 * Function to add links to the plugin action links
 *
 * @param array $links Array of links to be shown in plugin action links.
 */
function pmpro_primer_action_links( $links ) {
	global $this_menu_slug;
	if ( current_user_can( 'manage_options' ) ) {
		$new_links = array(
			'<a href="' . get_admin_url( null, 'index.php?page=' . $this_menu_slug ) . '">' . __( 'View primer', 'pmpro-primer-menu' ) . '</a>',
		);
	}
	return array_merge( $new_links, $links );
}