Manual:$wgDiffEngine

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<translate> Content handlers and storage</translate>: $wgDiffEngine
Specify the difference engine to use.
<translate> Introduced in version:</translate>	1.34.0 (Gerrit change 548763; git #f3058c81)
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	string or `null`
<translate> Default value:</translate>	`null`
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

Specify the difference engine to use.

Supported values:

'external' - Use an external diff engine, which must be specified via $wgExternalDiffEngine
'wikidiff2' - Use the wikidiff2 PHP extension
'php' - PHP implementations included in MediaWiki

The default (null) is to use the first engine that's available.