displaying featured image after 2nd paragraph

hi tom

currently, i am showing featured image after first paragraph. i am using the code pasted below. What changes should be done in the code so that the featured image gets displayed after the second paragraph.

function prefix_insert_after_paragraph2( $ads, $content ) {
 if ( ! is_array( $ads ) ) {
 return $content;
 $paragraphs = explode( $closing_p, $content );
 foreach ($paragraphs as $index => $paragraph) {
 if ( trim( $paragraph ) ) {
 $paragraphs[$index] .= $closing_p;
 }
 $n = $index + 1;
 if ( isset( $ads[ $n ] ) ) {
 $paragraphs[$index] .= $ads[ $n ];
 }
 }
 return implode( '', $paragraphs );
}
add_filter( 'the_content', 'insert_featured_image' );
function insert_featured_image ( $content ) {
 $content = prefix_insert_after_paragraph2( array(
 // The format is: '{PARAGRAPH_NUMBER}' => 'AD_CODE',
 '1' => get_the_post_thumbnail( get_the_ID(), 'post-single', array( 'class' => 'aligncenter' ) ),
 ), $content );
 }
}