Inserting AdSense code right after tag

Without using a plugin, the WordPress way would be to use the wp_head action to insert the script and then enqueue the script file:

function mytextdomain_adsense() {
    $output="
    <script>
      
    </script>";

    echo $output;
}
add_action('wp_head','mytextdomain_adsense');

function mytextdomain_adense_script() {
    wp_enqueue_script( 'my-adsense', '//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js', array(), '1.0.0', false );
}
add_action( 'wp_enqueue_scripts', 'mytextdomain_adense_script' );

And to add the async attribute to the script link:

function mytextdomain_add_async_attribute($tag, $handle) {
    if ( 'my-adsense' !== $handle ) {
      return $tag;
    }
    return str_replace( ' src', ' async src', $tag );
}
add_filter('script_loader_tag', 'mytextdomain_add_async_attribute', 10, 2);

This should be placed in the theme’s functions.php file (preferably a child theme so that it doesn’t get overwritten if there’s a theme update).

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