MediaWikiVersionFetcher.php

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<?php
 
class MediaWikiVersionFetcher {
 
    public function fetchVersion() {
        $defaultSettings = file_get_contents( __DIR__ . '/DefaultSettings.php' );
 
        $matches = [];
        preg_match( "/wgVersion = '([0-9a-zA-Z\.\-]+)';/", $defaultSettings, $matches );
 
        if ( count( $matches ) !== 2 ) {
            throw new RuntimeException( 'Could not extract the MediaWiki version from DefaultSettings.php' );
        }
 
        return $matches[1];
    }
 
}