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Edit File: class-wpklaviyo.php

<?php
/**
 * WPKlaviyo Helper Class.
 *
 * @package WooCommerceKlaviyo
 * @version 2.0.0
 */

/**
 * WPKlaviyo Helper Class
 */
class WPKlaviyo {

/**
	 * Determines whether a Klaviyo account is integrated based on presence of public API key.
	 *
	 * @param string $public_api_key Public API key of integrated Klaviyo account.
	 * @return bool
	 */
	public static function is_connected( $public_api_key = '' ) {
		if ( trim( $public_api_key ) != '' ) {
			return true;
		} else {
			$klaviyo_settings = get_option( 'klaviyo_settings' );
			if (
				isset( $klaviyo_settings['klaviyo_public_api_key'] )
				&& trim( $klaviyo_settings['klaviyo_public_api_key'] ) != ''
			) {
				return true;
			}

return false;
		}
	}

/**
	 * Constructor
	 */
	public function __construct() {
		global $klaviyowp_analytics;

if ( ! is_admin() ) {
			$klaviyowp_analytics = new WPKlaviyoAnalytics( WCK()->options->get_klaviyo_option( 'klaviyo_public_api_key' ) );
		}

// Display config message.
		$klaviyowp_message = new WPKlaviyoNotification();
		add_action( 'admin_notices', array( &$klaviyowp_message, 'config_warning' ) );

add_action(
			'widgets_init',
			function () {
				register_widget( 'Klaviyo_EmailSignUp_Widget' );
				// Only display Built-in Signup Form widget if klaviyo.js is checked in settings.
				if ( WCK()->options->get_klaviyo_option( 'klaviyo_popup' ) ) {
					register_widget( 'Klaviyo_EmbedEmailSignUp_Widget' );
				}
			}
		);
	}

/**
	 * Add default settings.
	 *
	 * @deprecated
	 * @return void
	 */
	public function add_defaults() {
		$klaviyo_settings = get_option( 'klaviyo_settings' );

if ( ( 'true' != $klaviyo_settings['installed'] ) || ! is_array( $klaviyo_settings ) ) {
			$klaviyo_settings = array(
				'installed'                  => 'true',
				'klaviyo_public_api_key'     => '',
				'klaviyo_newsletter_list_id' => '',
				'klaviyo_newsletter_text'    => '',
			);
			update_option( 'klaviyo_settings', $klaviyo_settings );
		}
	}

/**
	 * Format text.
	 *
	 * @deprecated
	 * @param string  $content Context to be formatted.
	 * @param boolean $br Contains a break element.
	 * @return mixed
	 */
	public function format_text( $content, $br = true ) {
		return $content;
	}
}

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