Bumped CodeIgniter's PHP requirement to 5.2.4.
Yes I know PHP 5.4 just came out, and yes I know PHP 5.3 has lovely features, but there are plenty of corporate systems running on CodeIgniter and PHP 5.3 still is not widely supported enough. CodeIgniter is great for distributed applications, and this is the highest we can reasonably go without breaking support. PHP 5.3 will most likely happen in another year or so. Fingers crossed on that one anyway...
diff --git a/system/libraries/Cache/Cache.php b/system/libraries/Cache/Cache.php
index 2e78a66..60998e3 100644
--- a/system/libraries/Cache/Cache.php
+++ b/system/libraries/Cache/Cache.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Cache/drivers/Cache_apc.php b/system/libraries/Cache/drivers/Cache_apc.php
index a3dd469..c387a30 100644
--- a/system/libraries/Cache/drivers/Cache_apc.php
+++ b/system/libraries/Cache/drivers/Cache_apc.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Cache/drivers/Cache_dummy.php b/system/libraries/Cache/drivers/Cache_dummy.php
index fcd55da..c9767e4 100644
--- a/system/libraries/Cache/drivers/Cache_dummy.php
+++ b/system/libraries/Cache/drivers/Cache_dummy.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Cache/drivers/Cache_file.php b/system/libraries/Cache/drivers/Cache_file.php
index a960730..c0be0de 100644
--- a/system/libraries/Cache/drivers/Cache_file.php
+++ b/system/libraries/Cache/drivers/Cache_file.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Cache/drivers/Cache_memcached.php b/system/libraries/Cache/drivers/Cache_memcached.php
index ffe6f2f..b8f2d7e 100644
--- a/system/libraries/Cache/drivers/Cache_memcached.php
+++ b/system/libraries/Cache/drivers/Cache_memcached.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Calendar.php b/system/libraries/Calendar.php
index a05a7ba..6c04de8 100644
--- a/system/libraries/Calendar.php
+++ b/system/libraries/Calendar.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Cart.php b/system/libraries/Cart.php
index 10b5362..60a1e52 100644
--- a/system/libraries/Cart.php
+++ b/system/libraries/Cart.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Driver.php b/system/libraries/Driver.php
index 4e89443..9a073b3 100644
--- a/system/libraries/Driver.php
+++ b/system/libraries/Driver.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 8d839d0..f30fe40 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Encrypt.php b/system/libraries/Encrypt.php
index 0b06189..b29eb47 100644
--- a/system/libraries/Encrypt.php
+++ b/system/libraries/Encrypt.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index cdb3d3d..8153af7 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Ftp.php b/system/libraries/Ftp.php
index ab395b0..4d96c00 100644
--- a/system/libraries/Ftp.php
+++ b/system/libraries/Ftp.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Image_lib.php b/system/libraries/Image_lib.php
index 9826eab..86b77bf 100644
--- a/system/libraries/Image_lib.php
+++ b/system/libraries/Image_lib.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Javascript.php b/system/libraries/Javascript.php
index 33df600..9ba9300 100644
--- a/system/libraries/Javascript.php
+++ b/system/libraries/Javascript.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Log.php b/system/libraries/Log.php
index 944173f..955277a 100644
--- a/system/libraries/Log.php
+++ b/system/libraries/Log.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Migration.php b/system/libraries/Migration.php
index d070972..c045ac0 100644
--- a/system/libraries/Migration.php
+++ b/system/libraries/Migration.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Pagination.php b/system/libraries/Pagination.php
index 35ac541..86b8d79 100644
--- a/system/libraries/Pagination.php
+++ b/system/libraries/Pagination.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Parser.php b/system/libraries/Parser.php
index 3212482..290e17f 100644
--- a/system/libraries/Parser.php
+++ b/system/libraries/Parser.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Profiler.php b/system/libraries/Profiler.php
index 04216be..d84e5d3 100644
--- a/system/libraries/Profiler.php
+++ b/system/libraries/Profiler.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Session.php b/system/libraries/Session.php
index 104b888..0b9d45b 100644
--- a/system/libraries/Session.php
+++ b/system/libraries/Session.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Table.php b/system/libraries/Table.php
index fb154e5..8651b9e 100644
--- a/system/libraries/Table.php
+++ b/system/libraries/Table.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Trackback.php b/system/libraries/Trackback.php
index 79a0091..3bea5f9 100644
--- a/system/libraries/Trackback.php
+++ b/system/libraries/Trackback.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Typography.php b/system/libraries/Typography.php
index 46c73ef..65e30b0 100644
--- a/system/libraries/Typography.php
+++ b/system/libraries/Typography.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Unit_test.php b/system/libraries/Unit_test.php
index 38d767c..2eb8df3 100644
--- a/system/libraries/Unit_test.php
+++ b/system/libraries/Unit_test.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php
index 89575c8..42664a5 100644
--- a/system/libraries/Upload.php
+++ b/system/libraries/Upload.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/User_agent.php b/system/libraries/User_agent.php
index cd644c0..9109edd 100644
--- a/system/libraries/User_agent.php
+++ b/system/libraries/User_agent.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Xmlrpc.php b/system/libraries/Xmlrpc.php
index 730a0fc..32e2e52 100644
--- a/system/libraries/Xmlrpc.php
+++ b/system/libraries/Xmlrpc.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Xmlrpcs.php b/system/libraries/Xmlrpcs.php
index 355d43f..fc41444 100644
--- a/system/libraries/Xmlrpcs.php
+++ b/system/libraries/Xmlrpcs.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *
diff --git a/system/libraries/Zip.php b/system/libraries/Zip.php
index 50e8492..e33eb4e 100644
--- a/system/libraries/Zip.php
+++ b/system/libraries/Zip.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  * 
diff --git a/system/libraries/javascript/Jquery.php b/system/libraries/javascript/Jquery.php
index 03574c6..f30d7c6 100644
--- a/system/libraries/javascript/Jquery.php
+++ b/system/libraries/javascript/Jquery.php
@@ -2,7 +2,7 @@
 /**
  * CodeIgniter
  *
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP 5.2.4 or newer
  *
  * NOTICE OF LICENSE
  *