Add content before, after content and in between paragraphs

functions.php

//Insert ads after fifth and seventh paragraph of single post content. 
add_filter( 'the_content', 'prefix_insert_post_ads' );
function prefix_insert_post_ads( $content ) {

    // Add your after 5th paragraph ad code first and then the 7th paragraph ads code.
    $ad_code = array( 
        '<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
        <!-- Mypt3 300x250 (M) -->
        <ins class="adsbygoogle"
             style="display:block"
             data-ad-client="ca-pub-8871976336473556"
             data-ad-slot="8933279338"
             data-ad-format="auto"
             data-full-width-responsive="true"></ins>
        <script>
             (adsbygoogle = window.adsbygoogle || []).push({});
        </script>',
        '<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
        <!-- Mypt3 300x250 (D) -->
        <ins class="adsbygoogle"
             style="display:block"
             data-ad-client="ca-pub-8871976336473556"
             data-ad-slot="9681670287"></ins>
        <script>
             (adsbygoogle = window.adsbygoogle || []).push({});
        </script>'
    );
 
    if ( is_single() && ! is_admin() ) {
    	/* Change the paragraph number as per your preference, currently with the following code the Ads code can be added after the second and fifth paragraph */
        return prefix_insert_after_paragraph( $ad_code, array( 5, 7 ) , $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;
        }

        $i = 0;
        foreach( $paragraph_id as $id ){
	        if ( $id == $index + 1 ) {
                $paragraphs[$index] .= $insertion[$i];
            }
            $i++;
        }
    }

    return implode( '', $paragraphs );
}




add_action( 'astra_entry_content_before', 'add_ads_before_content' );
function add_ads_before_content() {
    
    if ( ! is_single() ) {
        return;
    }

    // Add your before content ads code here.
    echo '<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
        <!-- Mypt3 300x250 (M) -->
        <ins class="adsbygoogle"
             style="display:block"
             data-ad-client="ca-pub-8871976336473556"
             data-ad-slot="8933279338"
             data-ad-format="auto"
             data-full-width-responsive="true"></ins>
        <script>
             (adsbygoogle = window.adsbygoogle || []).push({});
        </script>';
}


add_action( 'astra_entry_content_after', 'add_ads_after_content' );
function add_ads_after_content() {
    if ( ! is_single() ) {
        return;
    }
    // Add your after content ads code here.
    echo '<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
        <!-- Mypt3 300x250 (D) -->
        <ins class="adsbygoogle"
             style="display:block"
             data-ad-client="ca-pub-8871976336473556"
             data-ad-slot="9681670287"></ins>
        <script>
             (adsbygoogle = window.adsbygoogle || []).push({});
        </script>';
}