PHP7 new constants

1. Core

Added PHP_INT_MIN constant.

2. PCRE

Added PREG_JIT_STACKLIMIT_ERROR constant.

Three, Zlib

. ZLIB_NO_FLUSH
. ZLIB_PARTIAL_FLUSH
. ZLIB_SYNC_FLUSH
. ZLIB_FULL_FLUSH
.
#T1Lib support has been removed. The following methods and resources have also been removed:
Functions:

- imagepsbbox()

- imagepsencodefont()

- imagepsextendedfont()

- imagepsfreefont()
- imagepsloadfont( )
- imagepsslantfont()
- imagepstext()
Resources:
- 'gd PS font'
- 'gd PS encoding'