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Edit File: kla-analytics.php

<?php
/**
 * WPKlaviyoAnalytics.
 *
 * @package WooCommerceKlaviyo
 * @version 2.0.0
 */

/**
 * Handles inserting klaviyo.js for tracking.
 */
class WPKlaviyoAnalytics {

const HIGHEST_FILTER_PRIORITY = 0;
	const DEFAULT_FILTER_PRIORITY = 10;
	const FILTER_THREE_ARGUMENTS  = 3;
	const KLAVIYO_JS_HANDLE       = 'klaviyojs';

/**
	 * Klaviyo account public API key.
	 *
	 * @var string $klaviyo_public_key Klaviyo account public API key.
	 */
	private $klaviyo_public_key;

/**
	 * Constructor
	 *
	 * @param string $klaviyo_public_key Klaviyo public API key.
	 */
	public function __construct( $klaviyo_public_key ) {
		$this->klaviyo_public_key = $klaviyo_public_key;

// Add analytics.
		add_action(
			'wp_enqueue_scripts',
			array( $this, 'insert_analytics' ),
			self::HIGHEST_FILTER_PRIORITY
		);
		// Add js to identify user if commenter or logged-in. Priority 11 to add before Viewed Product.
		add_action(
			'wp_enqueue_scripts',
			array( $this, 'identify_browser' ),
			11
		);
	}

/**
	 * Check WooCommerce plugin status, and run is_checkout() function.
	 */
	public function is_woocommerce_checkout_page() {
		if ( is_plugin_active( 'woocommerce/woocommerce.php' ) ) {
			return is_checkout();
		}
	}

/**
	 * Add klaviyo.js as external resource if public API key is set.
	 */
	public function insert_analytics() {
		if ( '' == $this->klaviyo_public_key || $this->is_woocommerce_checkout_page() ) {
			return;
		}

$klaviyo_js_source = '//static.klaviyo.com/onsite/js/' . $this->klaviyo_public_key . '/klaviyo.js';
		wp_enqueue_script( self::KLAVIYO_JS_HANDLE, $klaviyo_js_source, null, WCK_API::VERSION, true );
		add_filter(
			'script_loader_tag',
			array( &$this, 'kl_add_async' ),
			self::DEFAULT_FILTER_PRIORITY,
			self::FILTER_THREE_ARGUMENTS
		);
	}

/**
	 * Filter to add async attribute to script tag.
	 * Currently only used on enqueue script handle "klaviyojs".
	 *
	 * @param string $tag     filter hook.
	 * @param string $handle  tag of enqueue script.
	 * @param string $src     source of script to be enqueued.
	 *
	 * @return string         if script handle is for installing klaviyo.js return script element
	 *                        with source set to $src and async attribute else return filter hook
	 */
	public function kl_add_async( $tag, $handle, $src ) {
		if ( self::KLAVIYO_JS_HANDLE !== $handle ) {
			return $tag;
		}

return "<script async src='" . $src . "'></script>"; // phpcs:ignore
	}

/**
	 * Get logged in user and commenter and make available to kl-identify-browser.js
	 */
	public function identify_browser() {
		global $current_user;

$commenter       = wp_get_current_commenter();
		$commenter_email = ! empty( $commenter['comment_author_email'] ) ? $commenter['comment_author_email'] : '';

wp_enqueue_script(
			'kl-identify-browser',
			plugins_url( '/js/kl-identify-browser.js', __FILE__ ),
			array( self::KLAVIYO_JS_HANDLE ),
			WCK_API::VERSION,
			true
		);

$kl_user = array(
			'current_user_email' => $current_user->user_email,
			'commenter_email'    => $commenter_email,
		);

wp_localize_script( 'kl-identify-browser', 'klUser', $kl_user );
	}
}

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