Add Google Adsense Ads to AMP Pages

function.php

<?php
// Do not copy the above php tag in your function.php
/**
 * Add Google Adsense Ad on top of the post content
 *
 * Add this to your function.php
 *
 * @author  MetaBlogue
 * @license GPL-2.0+
 * @link    https://metablogue.com/configure-enable-amp-wordpress/ 
 */
/**
 * Add Google Adsense code to AMP above the content
 */
add_action( 'pre_amp_render_post', 'isa_amp_add_content_filter' );
 
function isa_amp_add_content_filter() {
    add_filter( 'the_content', 'isa_amp_adsense_above_content' );
}
 
function isa_amp_adsense_above_content( $content ) {
    $publisher_id = 'ca-pub-5750478706187616';
    $ad_slot = '3512136773';
    // Add Adsense ad above AMP content
    $ad_code = '<amp-ad layout="fixed-height" height="100" type="adsense" data-ad-client="' . $publisher_id . '" data-ad-slot="' . $ad_slot . '"></amp-ad>';
    return $ad_code . $content . $ad_code;
}