insert ad after paragraph

insert-ad-dr.php

public function slipstream_ad_content($content)
	{
		if(!is_single() || get_post_type() == 'lp' || get_post_type() == 'got')
			return $content;

		global $agora_core, $dr_theme, $afp_openx;

		$openx_script = (is_object($afp_openx)) ? $afp_openx->openx_script(array('zoneid' => $dr_theme->openx_635x120_zoneid)) : '';

		$paragraphs = str_replace('</p>', '', $content);
		// remove empty array elements and break apart the p tags
		$paragraphs = array_filter(explode('<p>', $paragraphs));

		$count = count( $paragraphs );
		$where = floor( $count / 2 ) - 1;
		// if there are two or less paragraphs
		if( $count <= 2 ){
			$where = 1;
		}

		$new_content = '';
		foreach($paragraphs as $pnumber => $paragraph)
		{
			
			$new_content .= '<p>'.$paragraph.'</p>';

			if($pnumber == $where) {
				if(is_object($agora_core))
				{
					$new_content .= '<div id="in-flow-ad">' . $openx_script . '</div>';
				}
			}
		}
		
		return $new_content;
	}

insert-ad.php

public function slipstream_ad_content( $content ){

    global $agora_core;

    $paragraphs = preg_split( "/[\n]+/", $content );
    $count = count( $paragraphs );
    $where = floor( $count / 2 ) - 1;
    
    $new_content = '';
    foreach( $paragraphs as $pnumber => $paragraph )
    {
      $new_content .= $paragraph;
      if( $pnumber == $where ) {
        if( is_object( $agora_core ) )
        {
          $new_content .= '<div id="in-flow-ad">' . $this->openx( $this->openx_635x120_single_interstitial_zoneid ) . '</div>';
        }
      }
    }
    
    return $new_content;
  }