Array_filter and empty()

Question

Warning: array_filter() expects parameter 2 to be a valid callback, function \'empty\' not found or invalid function name....

Why is e

Answer 1

See the documentation page on empty():

Note: Because this is a language construct and not a function, it cannot be called using variable functions

So basically empty() is not a function, and because callback must be a function, empty() can not be passed as callback.

But you can create callback that may use empty(). The following should work in PHP > 5.3:

$arr = array_filter($arr, function($var){
    return empty($var);
});

In PHP < 5.3 you will need to create similar function first and then pass it to the array_filter().

Did it help?