Other changes to extensions
Changes to INI file handling
Migrating from PHP 5.4.x to PHP 5.5.x
PHP Manual

## New Global Constants

### GD

- `IMG_AFFINE_TRANSLATE`
- `IMG_AFFINE_SCALE`
- `IMG_AFFINE_ROTATE`
- `IMG_AFFINE_SHEAR_HORIZONTAL`
- `IMG_AFFINE_SHEAR_VERTICAL`
- `IMG_CROP_DEFAULT`
- `IMG_CROP_TRANSPARENT`
- `IMG_CROP_BLACK`
- `IMG_CROP_WHITE`
- `IMG_CROP_SIDES`
- `IMG_FLIP_BOTH`
- `IMG_FLIP_HORIZONTAL`
- `IMG_FLIP_VERTICAL`
- `IMG_BELL`
- `IMG_BESSEL`
- `IMG_BICUBIC`
- `IMG_BICUBIC_FIXED`
- `IMG_BLACKMAN`
- `IMG_BOX`
- `IMG_BSPLINE`
- `IMG_CATMULLROM`
- `IMG_GAUSSIAN`
- `IMG_GENERALIZED_CUBIC`
- `IMG_HERMITE`
- `IMG_HAMMING`
- `IMG_HANNING`
- `IMG_MITCHELL`
- `IMG_POWER`
- `IMG_QUADRATIC`
- `IMG_SINC`
- `IMG_NEAREST_NEIGHBOUR`
- `IMG_WEIGHTED4`
- `IMG_TRIANGLE`

### MySQLi

The `MYSQLI_SERVER_PUBLIC_KEY` option has been added for use with mysqli_options().

Other changes to extensions
Changes to INI file handling
Migrating from PHP 5.4.x to PHP 5.5.x
PHP Manual