Look at the Horde log (bump up logging level if necessary), look at 
web server error log...

Try bumping up php's memory limit. You don't provide any details on 
your configuration so it's hard to give any further assistance.

If you think it's a memory issue, try writing a test case that 
demonstrates this.

Hi,

I have a web app live in production, that compares two large strings, 
less than 5 MB in size.

And it's crashing right at the 3rd line below. Doesn't get past line 3 below.

$diff = new Horde_Text_Diff('auto', array( explode("\n", $contentsOld) 
, explode("\n", $contentsNew) ) );
$renderer = new Horde_Text_Diff_Renderer_Inline();
$diff = $renderer->render($diff);

$contentsOld and $contentsNew contain the two large strings - one read 
from a MySQL mediumtext field, and another coming from 
file_get_contents of a URL. Works fine for most use cases, but crashes 
when it gets above a certain size. I'm guessing around the 4-5 MB size.

Is there any way to get it to exit gracefully? It doesn't seem to be 
throwing any exceptions either.

And is there a way to know exactly where it's failing?

Thanks!

- Ravi