4 * This is in almost every respect equivalent to an array except
5 * that it keeps track of which keys were accessed.
7 * @warning For the sake of backwards compatibility with early versions
8 * of PHP 5, you must not use the $hash[$key] syntax; if you do
9 * our version of offsetGet is never called.
11 class HTMLPurifier_StringHash extends ArrayObject
13 protected $accessed = array();
16 * Retrieves a value, and logs the access.
18 public function offsetGet($index) {
19 $this->accessed[$index] = true;
20 return parent::offsetGet($index);
24 * Returns a lookup array of all array indexes that have been accessed.
25 * @return Array in form array($index => true).
27 public function getAccessed() {
28 return $this->accessed;
32 * Resets the access array.
34 public function resetAccessed() {
35 $this->accessed = array();