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-rw-r--r--library/HTMLPurifier/StringHash.php39
1 files changed, 39 insertions, 0 deletions
diff --git a/library/HTMLPurifier/StringHash.php b/library/HTMLPurifier/StringHash.php
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+++ b/library/HTMLPurifier/StringHash.php
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+<?php
+
+/**
+ * This is in almost every respect equivalent to an array except
+ * that it keeps track of which keys were accessed.
+ *
+ * @warning For the sake of backwards compatibility with early versions
+ * of PHP 5, you must not use the $hash[$key] syntax; if you do
+ * our version of offsetGet is never called.
+ */
+class HTMLPurifier_StringHash extends ArrayObject
+{
+ protected $accessed = array();
+
+ /**
+ * Retrieves a value, and logs the access.
+ */
+ public function offsetGet($index) {
+ $this->accessed[$index] = true;
+ return parent::offsetGet($index);
+ }
+
+ /**
+ * Returns a lookup array of all array indexes that have been accessed.
+ * @return Array in form array($index => true).
+ */
+ public function getAccessed() {
+ return $this->accessed;
+ }
+
+ /**
+ * Resets the access array.
+ */
+ public function resetAccessed() {
+ $this->accessed = array();
+ }
+}
+
+// vim: et sw=4 sts=4