UserNamePrefixSearch.php

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<?php
class UserNamePrefixSearch {
 
    public static function search( $audience, $search, $limit, $offset = 0 ) {
        $user = User::newFromName( $search );
 
        $dbr = wfGetDB( DB_REPLICA );
        $prefix = $user ? $user->getName() : '';
        $tables = [ 'user' ];
        $cond = [ 'user_name ' . $dbr->buildLike( $prefix, $dbr->anyString() ) ];
        $joinConds = [];
 
        // Filter out hidden user names
        if ( $audience === 'public' || !$audience->isAllowed( 'hideuser' ) ) {
            $tables[] = 'ipblocks';
            $cond['ipb_deleted'] = [ 0, null ];
            $joinConds['ipblocks'] = [ 'LEFT JOIN', 'user_id=ipb_user' ];
        }
 
        $res = $dbr->selectFieldValues(
            $tables,
            'user_name',
            $cond,
            __METHOD__,
            [
                'LIMIT' => $limit,
                'ORDER BY' => 'user_name',
                'OFFSET' => $offset
            ],
            $joinConds
        );
 
        return $res === false ? [] : $res;
    }
}