Como Inserir AdSense antes do Último Parágrafo no Wordpress

<?php
$paragraphAfter= 1; //display after the first paragraph
$content = apply_filters('the_content', get_the_content());
$content = explode("</p>", $content);
for ($i = 0; $i <count($content); $i++) {
if ($i == $paragraphAfter) { ?>
CODIGO QUE QUIERAS MOSTRAR
<?php
}
echo $content[$i] . "</p>";
} ?>

function ads_added_above_last_p($text) {
	if( is_single() ) :
		$ads_text = 'ADSENSE AQUI';
		if($pos1 = strrpos($text, '<p>')){
			$text1 = substr($text, 0, $pos1);
			$text2 = substr($text, $pos1);
			$content = $text1 . $ads_text . $text2;
		}
	endif;
	return $text;
	}
add_filter('the_content', 'ads_added_above_last_p');