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//Insert ads after paragraph of single post content.


add_filter( 'the_content', 'prefix_insert_post_ads' );

function prefix_insert_post_ads( $content ) {
        $ad_code = 'paste ad code here';
          if ( is_single() && ! is_admin() ) {
        return prefix_insert_after_paragraph( $ad_code, 8, $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 );
}

[COLOR=#cc7832][B]function [/B][/COLOR][COLOR=#ffc66d]showAd[/COLOR]([COLOR=#9876aa]$content[/COLOR]) {
    [COLOR=#9876aa]$closing_p [/COLOR]= [COLOR=#6a8759]'</p>'[/COLOR][COLOR=#cc7832];
    [/COLOR][COLOR=#9876aa]$paragraphs [/COLOR]= explode( [COLOR=#9876aa]$closing_p[/COLOR][COLOR=#cc7832], [/COLOR][COLOR=#9876aa]$content [/COLOR])[COLOR=#cc7832];
    [/COLOR][COLOR=#cc7832][B]if[/B][/COLOR](count([COLOR=#9876aa]$paragraphs[/COLOR]) >= [COLOR=#6897bb]8[/COLOR]) {
        [COLOR=#cc7832][B]echo [/B][/COLOR][COLOR=#6a8759]'PUT AD HTML HERE'[/COLOR][COLOR=#cc7832];
    [/COLOR]}

}