Inserting an html code between paragraphs in a post

I'm looking for a simple solution to add html code between paragraphs in posts. I tried to change file content-single.php:

I replaced

Code: Select all

<?php the_content(); ?>

with this

Code: Select all

<?php
$paragraphAfter= 1; //shows the ad after paragraph 1
$content = apply_filters('the_content', get_the_content());
$content = explode("</p>", $content);
for ($i = 0; $i <count($content); $i++) {
if ($i == $paragraphAfter) { ?>
<!-- START OF AD CODE -->
PASTE AD CODE HERE
<!-- END OF AD CODE -->
<?php
}
echo $content[$i] . "</p>";
} ?>

Unfortunately this method does not work on your theme. Could you please give me simple solution to make it working?

OK. I found the solution. I changed functions.php file:

Code: Select all

add_filter('the_content', 'mte_add_incontent_ad');
function mte_add_incontent_ad($content)
{   if(is_single()){
      $content_block = explode('<p>',$content);
      if(!empty($content_block[2]))
      {   $content_block[2] .= 'insert_ad_code_here';
      }
      for($i=1;$i<count($content_block);$i++)
      {   $content_block[$i] = '<p>'.$content_block[$i];
      }
      $content = implode('',$content_block);
   }
   return $content;   
}

With latest WP versions it is better to do "global" filtering with content, with queries.
Thanks for sharing correct solution.