Remove keys with false values from array in PHP

Question

I have an associative array with a whole pile of true/false values.

I am trying to remove all keys where the values are false.

So if the array is

array(
  'key1' => true,
  'key2' => false,
  'key3' => false,
  'key4' => true
);

I want to end up with

array(
  'key1' => true,
  'key4' => true
);

How would I do this?

Answer 1

$array = array_filter(array(
    'key1' => true,
    'key2' => false,
    'key3' => false,
    'key4' => true
));

array_filter()