httrack supports PHP and any other serer-side scripting 
langauge for that matter, since they all generate either 
ASCII or binary data as a result of their execution.

The segmentation fault can be generated by the webserver, 
especially if some incompatibility slipped into their PHP 
setup causing the webserver (usually Apache) to end the 
request with a segmentation fault.

The problem is that the segmentation fault message should 
be saved in the Apache logs and not the output sent by the 
server.

I could be wrong, but browse the site manually to check if 
the pages that httrack reports the segmentation fault on 
can be opened in a browser.