php array_filter for "False" value

Question

I am using array_filter in php:

$new_array = array_filter($updated, "check_if_value_is_null_or_false");

function check_if_value_is_null_or_false($val) {
    return !is_null($val);       
};

I understand that I can use is_null to filter out anything that has null value.

I also want to add a condition for string "False" as the value.

How would I modify the above?

Do you mean the string "False" or the false value as a Boolean? — Spencer Wieczorek
– Spencer Wieczorek, Commented Jun 8, 2016 at 22:49
I'm slightly confused by your function name compared to what it's doing. You are stating check_if_value_is_null_or_false as you would return true if the value is null or "False". Although inside you are returning "not null", would you want to return the true value or false for the second one? — Spencer Wieczorek
– Spencer Wieczorek, Commented Jun 8, 2016 at 22:55
I don't think my explanation was clear. But I got it working now. Thanks guys. — Steve Kim
– Steve Kim, Commented Jun 8, 2016 at 22:58

Mulan · Accepted Answer · 2016-06-08 23:06:23Z

10

Well you could make your own callback

function is_not_null_or_false($value) {
  return !(is_null($value) || $value === false);
}

array_filter($updated, 'is_not_null_or_false');

Or you could skip the separate function and do

array_filter($updated, function($x) { return !(is_null($x) || $x === false); });

EDIT

it appears you're looking for the string "False" not the boolean value

array_filter($updated, function($x) { return !(is_null($x) || $x === "False"); });

EDIT 2

For readability's sake, we changed

!is_null($x) && $x !== "False"

To

!(is_null($x) || $x === "False")

According to De Morgan's Laws these are equivalent but the second probably reads better especially given the function's name.

edited Jun 8, 2016 at 23:06

answered Jun 8, 2016 at 22:49

Mulan

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2 Comments

Spencer Wieczorek Over a year ago

You could also do !(is_null($value) || $value === false), it might make more sense given the function name.

Mulan Over a year ago

@SpencerWieczorek thanks, you're probably right. I updated the answer and provided reasoning.

Solonik · Accepted Answer · 2016-06-08 23:00:40Z

-2

Please check this example:

function check_if_value_is_null_or_false($val) {
    return !empty($val);
};

more information: http://php.net/manual/en/types.comparisons.php empty() return TRUE when variable is null and false.

answered Jun 8, 2016 at 23:00

Solonik

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1 Comment

Mulan Over a year ago

0, "0", "", false, and [] would also be filtered out. This does not meet the OP's specs.

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