sub find_entries
{

    my ($this, $that, $other) = @_;
    
	my $sth = $dbh->prepare("SELECT * " .
                            "FROM foo " . 
                            "WHERE this " .
                            "LIKE '%" . "?" . "%' " .
                            "AND that " .
                            "LIKE '%" . "?" . "%' " .
                            "AND other " .
                            "LIKE '%" . "?" . "%'");

    $sth->bind_param(1, $this);
    $sth->bind_param(2, $that);
    $sth->bind_param(3, $other);
    
	$sth->execute();
    
    ...
    
    return $entries;
}