$_search
$_search : mixed
Search array.
Stream filter class to remove null (\0) values.
Usage: stream_filter_register('horde_null', 'Horde_Stream_Filter_Null'); streamfilter[app|pre]pend($stream, 'horde_null', [ STREAMFILTER[READ|WRITE|ALL] ], [ $params ]);
$params is an array that can contain the following:
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See the enclosed file LICENSE for license information (LGPL). If you did not receive this file, see http://www.horde.org/licenses/lgpl21.