Source of class-wc-tracks-footer-pixel.php - main

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<?php
/**
 * Send Tracks events on behalf of a user using pixel images in page footer.
 *
 * @package WooCommerce\Tracks
 */
​
defined( 'ABSPATH' ) || exit;
​
/**
 * WC_Tracks_Footer_Pixel class.
 */
class WC_Tracks_Footer_Pixel {
    /**
     * Singleton instance.
     *
     * @var WC_Tracks_Footer_Pixel
     */
    protected static $instance = null;
​
    /**
     * Events to send to Tracks.
     *
     * @var array
     */
    protected $events = array();
​
    /**
     * Instantiate the singleton.
     *
     * @return WC_Tracks_Footer_Pixel
     */
    public static function instance() {
        if ( is_null( self::$instance ) ) {
            self::$instance = new WC_Tracks_Footer_Pixel();
        }
​
        return self::$instance;
    }
​
    /**
     * Constructor - attach hooks to the singleton instance.
     */
    public function __construct() {
        add_action( 'admin_footer', array( $this, 'render_tracking_pixels' ) );
        add_action( 'shutdown', array( $this, 'send_tracks_requests' ) );
    }
​
    /**
     * Record a Tracks event
     *
     * @param  array $event Array of event properties.
     * @return bool|WP_Error True on success, WP_Error on failure.
     */
    public static function record_event( $event ) {
        if ( ! $event instanceof WC_Tracks_Event ) {
            $event = new WC_Tracks_Event( $event );
        }
​
        if ( is_wp_error( $event ) ) {
            return $event;
        }
​