I did put that line in the php file. It's still in at the live site at this moment.

Could you tell me step by step what to do. Do I need to edit a read more in the item first en then write the tekst, to have the item appear without a read more button?
I didn't use two editors.

Well I do not understand how I can manage this by your last message. I'm sorry!

If the echo does not return anything then there is no fulltext present.

As I explained you have two options.
a) Use your editor's read more button to separate your text
b) Enable two editors from K2's advanced settings and use them both.

If you have not specified a fulltext and an intro then in listings all the text is handled as introtext.
PS. 2.6.1 is really outdated. You should consider updating to 2.6.8

But Krikor,

The problem is, I only want to display an intro tekst in the category view. There is no fulltext neccessary in this item. I want no read more button after this first item on this page: [link]www.artmeaning.nl/index.php/nl-NL/lezingen[/link]

I can't change the parameters in this category hiding the read more, because the second item on this category view page does have a full text.

Now you are explaining me how to use a read more. That's not my question.

It should bij like the regular Joomla Article category view. They will only show a read more if I used the read more in the editor.

I'm using JCE at this site.
I'll update K2.

I am explaining that without a read more button then you cannot have the distinction between introtext and fulltext.