Empty string supplied as input when parsing HTML in PHP

Question

I'm trying to make a Wordpress plugin, therefore, I'm trying to manipulate my DOM (the post content). Currently I have this code:

<?php
function mb_find_my_image( $content ) {
    if( is_home() ) { /* if is home start */

      $dom = new domDocument;
      $dom->loadHTML($content);
      $dom->preserveWhiteSpace = false;


    } /* if is home end */
    return $content;
}
add_filter( 'the_content', 'mb_find_my_image' );
?>

But I always get the following error:

Empty string supplied as input

I have tried using any other custom string that has html elements and it works. Also I've tried using var_export($content, true ), and this somewhat fixes the problem, but I get errors such as:

Call to a member function getAttribute() on a non-object

What I'm I doing wrong? I'm running this script on my local computer using WAMP Server.

var_dump($content) gives me:

null
string post content (actual html that is the post) ... (length=805)

It seems like you are not passing the parameter correctly. Check where you are calling your function and see what's being passed in. — Kyle
– Kyle, Commented Apr 17, 2013 at 18:37
@KyleGibbens Could you please tell me how to do that? I'm still new to PHP and Wordpress. — Mentalhead
– Mentalhead, Commented Apr 17, 2013 at 18:39
Inside which file is your mb_find_my_image function located? — montrealist
– montrealist, Commented Apr 17, 2013 at 19:04
I'm not very familiar with Wordpress, but find where the function is being called from (CTRL+F 'mb_find_my_image' on your source code) and var_dump the value passed in. Again, I'm not very familiar with Wordpress. If Wordpress calls the function using that 'add_filter' function, then makes sure your content is valid HTML. — Kyle
– Kyle, Commented Apr 17, 2013 at 19:06

Mentalhead · Accepted Answer · 2013-04-18 12:37:13Z

0

I have fixed the problem. The main problem was that I was calling the function (mb_find_my_image) from index.php, after I've removed the calling from index.php everything works as it should.

answered Apr 18, 2013 at 12:37

Mentalhead

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