数组过滤器只能删除没有空格的值(Array filter only remove the values without whitespaces)

数组示例

如上图所示，array_filter只删除像''而没有空格的值。 对于2值也为空的底部，但因为它有空白，所以它不会过滤它。 任何解决方案 我尝试preg_replace（）和trim（）也无法删除空值的空值...

Array Example

As the above pic show, the array_filter only remove the value which like ' ' without white space. For the bottom that 2 value is empty also but because it have white spaces so it wont filter it. Any solution? i try to preg_replace() and trim() also not able to remove the empty values with spaces...