I'm looking for something, but don't exactly know what.

I have a shortcode, let's call it [shortcode].

Users will input HTML tags inside, mostly images, but also links, images in links, etc., for example:

<img src="http://www.site.com/myimage.jpg" />
<a href="http://www.blabla.com"><img src="http://www.site.com/myimage2.jpg" /></a>

The point is I want to format URLs, differently, I want every img src to start with files/myimagescript?

So the code above should output:

<!--- shortcode code before input -->
<img src="files/myimagescript?http://www.site.com/myimage.jpg" />
    <a href="http://www.blabla.com"><img src="files/myimagescript?http://www.site.com/myimage2.jpg" /></a>
<!-- shortcode code after input -->

So basically I need to simply change src of images. And it should work for any number of images, from 1 to unlimited.

I'm thinking about foreach PHP loop, but I'm not sure how to grab each img src line from shortcode and process it before displaying?

1 Answer 1


you can use regex to find your the src and use that to append your "files/myimagescript?" to it:

function append_myimagescript($attr, $content){ 
    $pattern = '/src="([^"]*)"/i';
    $replacement = 'files/myimagescript?${1}';
    return preg_replace($pattern, $replacement, $content);
  • 1
    Pretty much the only way to... there's no way you'd match the image src's inside the post without a regex...(which should have you thinking.... is the approach i want to take)... If ever you need regex... it's usually the wrong way to approach it... (impo of course)...
    – t31os
    Mar 9, 2011 at 23:07
  • 1
    +1 to Bainternet though... i was thnking out loud more than anything... :)
    – t31os
    Mar 9, 2011 at 23:07
  • @t31os if you say so! I'm changing my approach then, if using Regex is the wrong thing :) Mar 10, 2011 at 1:13
  • 1
    It's not the wrong way, i just think it's more ideal if you can find a way to tackle a problem without regex(they're not the fastest of operations). For this particular problem though regex is pretty much your only option.
    – t31os
    Mar 10, 2011 at 11:26
  • I'd have to agree that if you find yourself depending on regex then that should be the last resort, how about a short code that takes the image src as an attribute as an alternative?
    – Bainternet
    Mar 10, 2011 at 13:06

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