uninstall.php

<?php
/**
 * a3 Portfolio Uninstall
 *
 * Uninstalling deletes options, tables, and pages.
 *
 */
if( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) 
	exit();

$plugin_key = 'a3_portfolios';

// Delete Google Font
delete_option( $plugin_key . '_google_api_key' . '_enable' );
delete_transient( $plugin_key . '_google_api_key' . '_status' );
delete_option( $plugin_key . '_google_font_list' );

if ( get_option( $plugin_key . '_clean_on_deletion' ) == 1 ) {
	delete_option( $plugin_key . '_google_api_key' );
	delete_option( $plugin_key . '_toggle_box_open' );
	delete_option( $plugin_key . '-custom-boxes' );

	delete_metadata( 'user', 0,  $plugin_key . '-' . 'plugin_framework_global_box' . '-' . 'opened', '', true );

	global $wpdb;

	// Delete Pages
	wp_trash_post( get_option( 'portfolio_page_id' ) );

	// Delete Plugin Settings
	delete_option( 'a3_portfolio_global_settings' );
	delete_option( 'a3_portfolio_item_cards_settings' );
	delete_option( 'a3_portfolio_global_item_expander_settings' );
	delete_option( 'a3_portfolio_item_posts_settings' );
	delete_option( 'a3_portfolio_shortcodes_setting' );

	delete_option( $plugin_key . '_clean_on_deletion' );

	// Delete Tables
	$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "a3_portfolio_feature" );
	$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "a3_portfolio_categorymeta" );
	$wpdb->query( "DROP TABLE IF EXISTS " . $wpdb->prefix . "a3_portfolio_attributes" );

	// Delete postmeta
	delete_post_meta_by_key( '_a3_portfolio_meta_layout_column' );
	delete_post_meta_by_key( '_a3_portfolio_meta_gallery_wide' );
	delete_post_meta_by_key( '_a3_portfolio_meta_thumb_position' );
	delete_post_meta_by_key( '_a3_portfolio_launch_site_url' );
	delete_post_meta_by_key( '_a3_portfolio_launch_button_text' );
	delete_post_meta_by_key( '_a3_portfolio_viewmore_button_text' );
	delete_post_meta_by_key( '_a3_portfolio_image_gallery' );
	$wpdb->query( "DELETE FROM $wpdb->postmeta WHERE meta_key LIKE '_a3_portfolio_meta_feature_%';" );

	// Delete posts
	$wpdb->query( "DELETE FROM {$wpdb->posts} WHERE post_type IN ( 'a3-portfolio' );" );

	// Delete wpml data
	$string_ids = $wpdb->get_col( "SELECT id FROM {$wpdb->prefix}icl_strings WHERE context='a3 Portfolios' " );
	if ( is_array( $string_ids ) && count( $string_ids ) > 0 ) {
	    $str = join( ',', array_map( 'intval', $string_ids ) );
	    $wpdb->query( "
			DELETE s.*, t.* FROM {$wpdb->prefix}icl_strings s LEFT JOIN {$wpdb->prefix}icl_string_translations t ON s.id = t.string_id
			WHERE s.id IN ({$str})" );
	    $wpdb->query( "DELETE FROM {$wpdb->prefix}icl_string_positions WHERE string_id IN ({$str})" );
	}

}