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

You can use just array_filter() function without callback:

Remove empty array elements in PHP

$arr = array("PHP", "HTML", "CSS", "", "JavaScript", null, 0);
print_r(array_filter($arr)); // removing blank, null, false, 0 (zero) values

Result:

Array
(
    [0] => PHP
    [1] => HTML
    [2] => CSS
    [4] => JavaScript
)