How can I strip whitespace only elements from an array?

Question

How I can remove all elements of an array that contain just whitespace, not whitespace in an element like \"foobar \" but just empty array elements like <

Answer 1

$array = array('foo','  ','bar ');

foreach ($array as $key => $value) {
    if (trim($value) == '') unset($array[$key]);
}

Array when dumped then contains:

array(2) {
  [0]=>
  string(3) "foo"
  [2]=>
  string(4) "bar "
}