array_filter 过滤一维中空数组，数组的序列不变

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<?php header('Content-type:text;charset=utf8');   $str = "%11111%22222%333333%"; $arr = explode('%',$str); print_r($arr);   print_r(array_filter($arr)); ?><br>--------------------------------------------------Array (     [0] =>     [1] => 11111     [2] => 22222     [3] => 333333     [4] => ) Array (     [1] => 11111     [2] => 22222     [3] => 333333 )<br>