If php is looping through an assoc array using the key() function the next element after an element has been unset is then skipped. I think the problem is the array pointer is not being set appropriately after the unset.
Here is below is an example of the behavior.


$a = array("a" => 1, "b" => 2, "c" => 3, "d" => 4, "e" => 5);

reset($a);
while($key = key($a)){

	echo $key . "<br>\n";
	
	if($a[$key] == 2){
		unset($a[$key]);		
	}
	
	next($a);
}

var_dump($a);

/*

This returns the below. Notice the "c" key is not given.

a
b
d
e
array(4) {
  ["a"]=>
  int(1)

  ["c"]=>
  int(3)

  ["d"]=>
  int(4)

  ["e"]=>
  int(5)
}


*/