Einen Google-Werbeblock nach dem ersten Absatz eines Artikels einfügen.

adsense.php

<?php

/* =============================================================================
 Google-Werbung nach dem ersten Absatz einfuegen
============================================================================= */

add_filter( 'the_content', 'prefix_insert_post_ads' );

function prefix_insert_post_ads( $content ) {
	
	$ad_code = '<!-- In Content Google Advertisement -->		
<div class="content-ads manuell">
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- In Content Ads -->
<ins class="adsbygoogle"
     style="display:inline-block;width:336px;height:280px"
     data-ad-client="ca-pub-4412877567706303"
     data-ad-slot="2668338600"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div>
<!-- END In Content Google Advertisement -->';

	if ( is_single() && ! is_admin() ) {
		return prefix_insert_after_paragraph( $ad_code, 1, $content );
	}
	
	return $content;
}
 
// Parent Function that makes the magic happen
 
function prefix_insert_after_paragraph( $insertion, $paragraph_id, $content ) {
	$closing_p = '</p>';
	$paragraphs = explode( $closing_p, $content );
	foreach ($paragraphs as $index => $paragraph) {

		if ( trim( $paragraph ) ) {
			$paragraphs[$index] .= $closing_p;
		}

		if ( $paragraph_id == $index + 1 ) {
			$paragraphs[$index] .= $insertion;
		}
	}
	
	return implode( '', $paragraphs );
}