Security Enhancements and Fixes in PHP 5.2.11:
* Fixed certificate validation inside php_openssl_apply_verification_policy. (Ryan Sleevi, Ilia)
* Fixed sanity check for the color index in imagecolortransparent(). (Pierre)
* Added missing sanity checks around exif processing. (Ilia)
* Fixed bug #44683 (popen crashes when an invalid mode is passed). (Pierre)