Manual:$wgSearchForwardUrl

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<translate> Search</translate>: $wgSearchForwardUrl
Set this to a URL to forward search requests to some external location.
<translate> Introduced in version:</translate>	1.4.0
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	(URL string)
<translate> Default value:</translate>	null
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

Set this to a URL to forward search requests to some external location. If the URL includes '$1', this will be replaced with the URL-encoded search term. For example, to forward to Google you'd have something like:

$wgSearchForwardUrl = 'http://www.google.com/search?q=$1' .
                      '&domains=http://example.com' .
                      '&sitesearch=http://example.com' .
                      '&ie=utf-8&oe=utf-8';

You also need to set $wgDisableTextSearch = true; or $wgSearchForwardUrl is ignored.

From versions 1.4.8 to 1.4.15, this setting was incorrectly named $wgForwardSearchUrl in DefaultSettings.php. If you are using one of those versions then this alternative name should be used instead.