Insert ads after second paragraph of single post content

<?php
    //Insert ads after second paragraph of single post content.
    add_filter( 'the_content', 'prefix_insert_post_ads' );
    function prefix_insert_post_ads( $content ) {
        $ad_code = '<div>Ads code here</div>';
        if ( is_single() && ! is_admin() ) {
            return prefix_insert_after_paragraph( $ad_code, 2, $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 );
    }
?>

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