Changes since 4.3.8:
* fixes to GPC input processing
* bundled GD extension synced with 2.0.28, re-introducing write support
for GIF (patent expiration worldwide)
* Implemented periodic PCRE compiled regexp cache cleanup, to avoid memory
exhaustion
* Fixed strip_tags() to correctly handle '\0' characters.
* Rewritten UNIX and Windows install help files.
* Fixed a file-descriptor leak with phpinfo() and other 'special' URLs.
* Fixed possible crash inside php_shutdown_config().
* Fixed isset crashes on arrays.
* Fixed imagecreatefromstring() crashes with external GD library.
* Fixed fgetcsv() parsing of strings ending with escaped enclosures.
* Fixed overflow in array_slice(), array_splice(), substr(), substr_replace(),
strspn(), strcspn().
* Fixed '\0' in Authenticate header passed via safe_mode.
* Allow bundled GD to compile against freetype 2.1.2.
All in all this release fixes over 50 bugs that have been discovered
and resolved since the 4.3.8 release.
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