Tests Ange

. ({{#ifeq:$4|0|empty|{{#ifeq:$1|0||$1 categories{{#ifeq:{{#expr:$3+$2}}|0||,}}}} {{#ifeq:$2|0||$2 pages{{#ifeq:$3|0||,}}}} {{#ifeq:$3|0||$3 files}}}})

{{#ifeq:10|5||10 categories}}

$1 Number of subcategories
$2 Number of articles (not including category pages or file pages)
$3 Number of uploaded files
$4 Total number of member pages, including category pages and file pages
$5 Something close to ($1 C, $2 P, $3 F) but with anything that is 0 omitted.

More precisely, a comma separated list of the number of pages (mediawiki:categorytree-num-pages), subcategories (mediawiki:categorytree-num-categories), and files (mediawiki:categorytree-num-files) in the category, or empty (mediawiki:categorytree-num-empty) in the case the category has no members. In versions prior to those around 1.19 this value was different. See older version of these docs.