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-rw-r--r--engine/lib/cache.php19
1 files changed, 18 insertions, 1 deletions
diff --git a/engine/lib/cache.php b/engine/lib/cache.php
index fa5f990df..e8b996e59 100644
--- a/engine/lib/cache.php
+++ b/engine/lib/cache.php
@@ -127,6 +127,23 @@
*/
abstract public function clear();
+ /**
+ * Add a key only if it doesn't already exist.
+ * Implemented simply here, if you extend this class and your caching engine provides a better way then
+ * override this accordingly.
+ *
+ * @param string $key
+ * @param string $data
+ * @return bool
+ */
+ public function add($key, $data)
+ {
+ if (!isset($this[$key]))
+ return $this->save($key, $data);
+
+ return false;
+ }
+
// ARRAY ACCESS INTERFACE //////////////////////////////////////////////////////////
function offsetSet($key, $value)
{
@@ -388,7 +405,7 @@
/**
- * A simple function that selects the default caching engine.
+ * A simple function that selects the default memory caching engine.
*
* This function provides a central way to get a cache for storing local variables.
*