Create Adsense shortcode for WordPress

1. Go to Your Dashboard WordPress
2. Click menu -> Appearance
3. Click editor -> choose functions.php
4. Add below code inside <?php

/*
 * enqueue adsbygoogle.js in the footer & 
 * create a WordPress shortcode with your Google AdSense code
 * follow me on Twitter: @DimasSkynetCybe
 */

function loadAdsenseJS() {
  wp_register_script( 'google-adsense', '//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js', '', '', true );
  wp_enqueue_script( 'google-adsense' );
}
add_action( 'wp_enqueue_scripts', 'loadAdsenseJS' );

function AdSense() {
  $output = '<ins class="adsbygoogle"
    style="background-color: transparent;
      text-decoration: none;
      display:inline-block;
      width:336px;
      height:280px"
    data-ad-client="ca-pub-xxYourUniqueIdxx"
    data-ad-slot="xxUniqueIdSlotxx"></ins>
  <script>
  (adsbygoogle = window.adsbygoogle || []).push({});
  </script>';
  
  return $output;
}
add_shortcode( 'adsense', 'AdSense' );

/*
 * Usage: add [adsense] in your WordPress posts 
 * where you want your ad to appear
 */