Using PHP's Array_filter () function to remove the code sharing of multidimensional null values

What do you think of when the array is empty in our development process? The first thought should be the empty function, but it is not right to use the empty function to judge Null, because when the value is a multidimensional number, the empty result is a value

In fact, we can use the Array_filter function to easily remove the multidimensional null value, and the array subscript has not changed, the following is an example of usage:

The above code outputs the result:

This will be null or NULL or FALSE to exclude the value, in order to avoid the program a loophole!