Question

I’m trying to add a code to the_content() function. I tried the following

function add_something($content) {
    echo "test";
}
add_filter( 'the_content', 'add_something', 6); 

After adding the filter my posts return just the echo test without the content. How can I execute my custom code without omitting the content?

Answer 1

I would surmise you need something like that (if it’s indeed a filter callback):

function add_something($content) {
    return "test" . $content;
}

Seems what the docs say:
http://wordpress.org/support/topic/add-something-to-the_content