Using Custom Field for PDF Upload in Posts

You can use the following code to style pdf links with your stylesheet. it gives all pdf links in the post content a class of “pdf”.

put this in your theme’s functions.php

function add_pdf_class($content) {
  $patterns = '/<a(.*?)href=["|\'](.*?)([\.pdf|\.PDF])["|\']/';
  $replacements = '<a\1href="\2\3" class="pdf"';
  return preg_replace($patterns, $replacements, $content);
}
add_filter('the_content', 'add_pdf_class');

Thanks, so much.

Hmmm…found a glitch. I’m going back through old posts that I’ve imported in which the person entering post images left the default link to an image added. A feature I think should be disabled (image links to itself by default). Anyway, the PDF class is being added to the link for JPG post images.

Can you give us a link to a webpage which have the pdf class being assigned to images. On my testserver all other links including links to post thumbnails don’t get the pdf class.

Took me a minute to find one. I cleaned up a lot of them by simply removing the anchor tags. Here you go: https://mstroopers.com/dev/2010/12/son-credits-success-trooper-dad-and-mom/

I changed the code a little bit, try it with this:

function add_pdf_class($content) {
  $patterns = '/<a(.*?)href=["|\'](.*?)\.(pdf|PDF)["|\']/';
  $replacements = '<a\1href="\2.\3" class="pdf"';
  return preg_replace($patterns, $replacements, $content);
}
add_filter('the_content', 'add_pdf_class');

Worked like a charm! Again, thanks. Really appreciate it.