Remove NULL, FALSE, and '' - but not 0 - from a PHP array

Question

I want to remove NULL, FALSE and \'\' values .

I used array_filter but it removes the 0\' s also.

Answer 1

array_filter should work fine if you use the identical comparison operator.

here's an example

$values = [NULL, FALSE, '', 0, 1];

function myFilter($var){
  return ($var !== NULL && $var !== FALSE && $var !== '');
}

$res = array_filter($values, 'myFilter');

Or if you don't want to define a filtering function, you can also use an anonymous function (closure):

$res = array_filter($values, function($value) {
    return ($value !== null && $value !== false && $value !== ''); 
});

If you just need the numeric values you can use is_numeric as your callback: example

$res = array_filter($values, 'is_numeric');

Answer 2

From http://php.net/manual/en/function.array-filter.php#111091 :

If you want to remove NULL, FALSE and Empty Strings, but leave values of 0, you can use strlen as the callback function:

array_filter($array, 'strlen');

Answer 3

Alternatively you can use array_filter with the 'strlen' parameter:

// removes all NULL, FALSE and Empty Strings but leaves 0 (zero) values
$result = array_filter($array, 'strlen');

https://www.php.net/manual/en/function.array-filter.php#111091