WP_Plugin_Install_List_Table::prepare_items

	public function prepare_items() {
		include_once ABSPATH . 'wp-admin/includes/plugin-install.php';

		global $tabs, $tab, $paged, $type, $term;

		wp_reset_vars( array( 'tab' ) );

		$paged = $this->get_pagenum();

		$per_page = 36;

		// These are the tabs which are shown on the page.
		$tabs = array();

		if ( 'search' === $tab ) {
			$tabs['search'] = __( 'Search Results' );
		}
		if ( 'beta' === $tab || false !== strpos( get_bloginfo( 'version' ), '-' ) ) {
			$tabs['beta'] = _x( 'Beta Testing', 'Plugin Installer' );
		}
		$tabs['featured']    = _x( 'Featured', 'Plugin Installer' );
		$tabs['popular']     = _x( 'Popular', 'Plugin Installer' );
		$tabs['recommended'] = _x( 'Recommended', 'Plugin Installer' );
		$tabs['favorites']   = _x( 'Favorites', 'Plugin Installer' );
		if ( current_user_can( 'upload_plugins' ) ) {
			// No longer a real tab. Here for filter compatibility.
			// Gets skipped in get_views().
			$tabs['upload'] = __( 'Upload Plugin' );
		}

		$nonmenu_tabs = array( 'plugin-information' ); // Valid actions to perform which do not have a Menu item.

		/**
		 * Filters the tabs shown on the Add Plugins screen.
		 *
		 * @since 2.7.0
		 *
		 * @param string[] $tabs The tabs shown on the Add Plugins screen. Defaults include
		 *                       'featured', 'popular', 'recommended', 'favorites', and 'upload'.
		 */
		$tabs = apply_filters( 'install_plugins_tabs', $tabs );

		/**
		 * Filters tabs not associated with a menu item on the Add Plugins screen.
		 *
		 * @since 2.7.0
		 *
		 * @param string[] $nonmenu_tabs The tabs that don't have a menu item on the Add Plugins screen.
		 */
		$nonmenu_tabs = apply_filters( 'install_plugins_nonmenu_tabs', $nonmenu_tabs );

		// If a non-valid menu tab has been selected, And it's not a non-menu action.
		if ( empty( $tab ) || ( ! isset( $tabs[ $tab ] ) && ! in_array( $tab, (array) $nonmenu_tabs, true ) ) ) {
			$tab = key( $tabs );
		}

		$installed_plugins = $this->get_installed_plugins();

		$args = array(
			'page'     => $paged,
			'per_page' => $per_page,
			// Send the locale to the API so it can provide context-sensitive results.
			'locale'   => get_user_locale(),
		);

		switch ( $tab ) {
			case 'search':
				$type = isset( $_REQUEST['type'] ) ? wp_unslash( $_REQUEST['type'] ) : 'term';
				$term = isset( $_REQUEST['s'] ) ? wp_unslash( $_REQUEST['s'] ) : '';

				switch ( $type ) {
					case 'tag':
						$args['tag'] = sanitize_title_with_dashes( $term );
						break;
					case 'term':
						$args['search'] = $term;
						break;
					case 'author':
						$args['author'] = $term;
						break;
				}

				break;

			case 'featured':
			case 'popular':
			case 'new':
			case 'beta':
				$args['browse'] = $tab;
				break;
			case 'recommended':
				$args['browse'] = $tab;
				// Include the list of installed plugins so we can get relevant results.
				$args['installed_plugins'] = array_keys( $installed_plugins );
				break;

			case 'favorites':
				$action = 'save_wporg_username_' . get_current_user_id();
				if ( isset( $_GET['_wpnonce'] ) && wp_verify_nonce( wp_unslash( $_GET['_wpnonce'] ), $action ) ) {
					$user = isset( $_GET['user'] ) ? wp_unslash( $_GET['user'] ) : get_user_option( 'wporg_favorites' );

					// If the save url parameter is passed with a falsey value, don't save the favorite user.
					if ( ! isset( $_GET['save'] ) || $_GET['save'] ) {
						update_user_meta( get_current_user_id(), 'wporg_favorites', $user );
					}
				} else {
					$user = get_user_option( 'wporg_favorites' );
				}
				if ( $user ) {
					$args['user'] = $user;
				} else {
					$args = false;
				}

				add_action( 'install_plugins_favorites', 'install_plugins_favorites_form', 9, 0 );
				break;

			default:
				$args = false;
				break;
		}

		/**
		 * Filters API request arguments for each Add Plugins screen tab.
		 *
		 * The dynamic portion of the hook name, `$tab`, refers to the plugin install tabs.
		 * Default tabs include 'featured', 'popular', 'recommended', 'favorites', and 'upload'.
		 *
		 * @since 3.7.0
		 *
		 * @param array|false $args Plugin install API arguments.
		 */
		$args = apply_filters( "install_plugins_table_api_args_{$tab}", $args );

		if ( ! $args ) {
			return;
		}

		$api = plugins_api( 'query_plugins', $args );

		if ( is_wp_error( $api ) ) {
			$this->error = $api;
			return;
		}

		$this->items = $api->plugins;

		if ( $this->orderby ) {
			uasort( $this->items, array( $this, 'order_callback' ) );
		}

		$this->set_pagination_args(
			array(
				'total_items' => $api->info['results'],
				'per_page'    => $args['per_page'],
			)
		);

		if ( isset( $api->info['groups'] ) ) {
			$this->groups = $api->info['groups'];
		}

		if ( $installed_plugins ) {
			$js_plugins = array_fill_keys(
				array( 'all', 'search', 'active', 'inactive', 'recently_activated', 'mustuse', 'dropins' ),
				array()
			);

			$js_plugins['all'] = array_values( wp_list_pluck( $installed_plugins, 'plugin' ) );
			$upgrade_plugins   = wp_filter_object_list( $installed_plugins, array( 'upgrade' => true ), 'and', 'plugin' );

			if ( $upgrade_plugins ) {
				$js_plugins['upgrade'] = array_values( $upgrade_plugins );
			}

			wp_localize_script(
				'updates',
				'_wpUpdatesItemCounts',
				array(
					'plugins' => $js_plugins,
					'totals'  => wp_get_update_data(),
				)
			);
		}
	}