PHP过滤数组中的0、null、false和‘‘等空值

$entry = array(
             0 => 'foo',
             1 => false,
             2 => -1,
             3 => null,
             4 => '',
             5 => 0
          );
print_r(array_filter($entry));

//输出
Array
(
    [0] => foo
    [2] => -1
)