Fix a few typos and add a backport (compat) for hex2bin()
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
index 1c6e76b..3e1280b 100644
--- a/system/core/CodeIgniter.php
+++ b/system/core/CodeIgniter.php
@@ -249,7 +249,7 @@
 	require_once(BASEPATH.'core/compat/mbstring.php');
 	require_once(BASEPATH.'core/compat/hash.php');
 	require_once(BASEPATH.'core/compat/password.php');
-	require_once(BASEPATH.'core/compat/array.php');
+	require_once(BASEPATH.'core/compat/standard.php');
 
 /*
  * ------------------------------------------------------