1: <?php
2:
3: /**
4: * This is in almost every respect equivalent to an array except
5: * that it keeps track of which keys were accessed.
6: *
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.
10: */
11: class HTMLPurifier_StringHash extends ArrayObject
12: {
13: protected $accessed = array();
14:
15: /**
16: * Retrieves a value, and logs the access.
17: */
18: public function offsetGet($index) {
19: $this->accessed[$index] = true;
20: return parent::offsetGet($index);
21: }
22:
23: /**
24: * Returns a lookup array of all array indexes that have been accessed.
25: * @return Array in form array($index => true).
26: */
27: public function getAccessed() {
28: return $this->accessed;
29: }
30:
31: /**
32: * Resets the access array.
33: */
34: public function resetAccessed() {
35: $this->accessed = array();
36: }
37: }
38:
39: // vim: et sw=4 sts=4
40: