Thread:Extension talk:SphinxSearch/Search suggestions do not include other namespaces/reply

With assistance from a kind soul on the MediaWiki Users forums I've got the answer.

In PrefixSearch.php you must change the following block of code:

...to the following:

Credit: Didster (http://www.mwusers.com/forums/showthread.php?22328-Can-search-suggestions-contain-results-from-non-default-namespaces&p=68347&viewfull=1#post68347)