Unset an array item in a foreach loop

Trying to remove an item from a PHP foreach loop is not a straight forward job, because, PHP works on a copy of that array, so you need to do it like this:

$items = array('a','b','c','d');
foreach ($items as $key => $value) {
    if ($value=='b' || $value=='d') {

this outputs:

array(2) {
  string(1) "a"
  string(1) "c"

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