META PIXEL BASE + MANUAL ADVANCED MATCHING (WooCommerce/WordPress)

/**

 * =============================================================================

 * META PIXEL BASE + MANUAL ADVANCED MATCHING (WooCommerce/WordPress)

 * Pixel ID:

 * =============================================================================

 * IMPORTANT:

 * - Remove any other hard-coded Meta Pixel base code (to avoid duplicates).

 * - Only run this if you have user consent to send PII.

 * =============================================================================

 */

add_action('wp_head', 'voelgoed_meta_pixel_base_with_advanced_matching', 20);

function voelgoed_meta_pixel_base_with_advanced_matching() {

    // If you run a consent system, gate this here.

    // Example (pseudo): if (function_exists('your_consent_fn') && !your_consent_fn()) return;

    $pixel_id = '';

    $am = []; // Advanced Matching object

    // Logged-in user data

    if ( is_user_logged_in() ) {

        $user = wp_get_current_user();

        if ( $user && ! empty($user->user_email) ) {

            $am['em'] = strtolower(trim($user->user_email));

        }

        if ( $user && ! empty($user->first_name) ) {

            $am['fn'] = strtolower(trim($user->first_name));

        }

        if ( $user && ! empty($user->last_name) ) {

            $am['ln'] = strtolower(trim($user->last_name));

        }

        // external_id can help matching (use a stable internal ID)

        $am['external_id'] = (string) $user->ID;

    }

    // WooCommerce billing data (if available)

    if ( function_exists('WC') && WC()->customer ) {

        $phone = WC()->customer->get_billing_phone();

        if ( $phone ) {

            // Normalize phone to digits (Meta recommends consistent formatting)

            if ( function_exists('wc_sanitize_phone_number') ) {

                $phone = wc_sanitize_phone_number($phone);

            } else {

                $phone = preg_replace('/\D+/', '', $phone);

            }

            if ( ! empty($phone) ) {

                $am['ph'] = $phone;

            }

        }

        $city = WC()->customer->get_billing_city();

        if ( $city ) $am['ct'] = strtolower(trim($city));

        $state = WC()->customer->get_billing_state();

        if ( $state ) $am['st'] = strtolower(trim($state));

        $postcode = WC()->customer->get_billing_postcode();

        if ( $postcode ) $am['zp'] = preg_replace('/\s+/', '', trim($postcode));

        $country = WC()->customer->get_billing_country();

        if ( $country ) $am['country'] = strtolower(trim($country));

    }

    ?>

    <!-- Meta Pixel Code (Base + Manual Advanced Matching) -->

    <script>

      !function(f,b,e,v,n,t,s)

      {if(f.fbq)return;n=f.fbq=function(){n.callMethod?

      n.callMethod.apply(n,arguments):n.queue.push(arguments)};

      if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';

      n.queue=[];t=b.createElement(e);t.async=!0;

      t.src=v;s=b.getElementsByTagName(e)[0];

      s.parentNode.insertBefore(t,s)}(window,document,'script',

      'https://connect.facebook.net/en_US/fbevents.js');

      <?php if ( ! empty($am) ) : ?>

        fbq('init', <?php echo wp_json_encode($pixel_id); ?>, <?php echo wp_json_encode($am); ?>);

      <?php else : ?>

        fbq('init', <?php echo wp_json_encode($pixel_id); ?>);

      <?php endif; ?>

      fbq('track', 'PageView');

    </script>

    <noscript>

      <img alt="" height="1" width="1" style="display:none"

      src="https://www.facebook.com/tr?id=<?php echo esc_attr($pixel_id); ?>&ev=PageView&noscript=1"/>

    </noscript>

    <!-- End Meta Pixel Code -->

    <?php

}