+ * To find the temporary path for the current wiki, developers must not use
+ * this variable directly. Use the global function wfTempDir() instead.
+ *
+ * The temporary directory is expected to be shared with other applications,
+ * including other MediaWiki instances (which might not run the same version
+ * or configution). When storing files here, take care to avoid conflicts
+ * with other instances of MediaWiki. For example, when caching the result
+ * of a computation, the file name should incorporate the input of the
+ * computation so that it cannot be confused for the result of a similar
+ * computation by another MediaWiki instance.