Manual:$wgCategoryCollation

Category: $wgCategoryCollation
What collation categories use to sort with
Introduced in version:	1.17.0 (r72308)
Removed in version:	still in use
Allowed values:	string
Default value:	uppercase

Other settings: Alphabetical | By Function

Details

Used when the collation algorithm changes to determine which categorylinks rows need updating.

Currently supports uppercase (make everything uppercase for sorting), identity [in 1.18+] (sort by binary value of string when stored as utf-8. Essentially sort by code point), and uca-default (complex, much more multi-lingual friendly category collation) collations.

Since MediaWiki 1.18 extensions can add extra collations via the Collation::factory hook.

Warning:

After changing this option, you must run updateCollation.php or your categories will show results out of order uca-default requires the PHP intl extension

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