langs.model.xml: Additions to PHP highlight (closes #488, fixes #459)
+ Add some extensions.
+ Additions to PHP highlight:
* Added/updated huge amount of PHP Functions of several categories:
Filesystem, Directory, Program execution, Fileinfo, Date/Time Functions,
Calendar, Variable handling, Function handling, Array, Filter,
Classes/Object, String, POSIX Regex, Output Control, Password Hashing,
OpenSSL, Mcrypt, Mhash, Hash, FTP, SSH2, cURL, LDAP, IMAP, Network, JSON,
URL, Stream, XML Parser, Misc., GD and Image, Exif, Zip, Zlib, Apache,
PHP Options/Info, Error Handling, Semaphore.
* Update functions related to databases (*sql_ ; sqlite_ ; odbc_ ; dba_),
also adding MySQLi and MaxDB procedural style commands.
* Added/updated PHP Reserved Words, Control Structures, and Predefined Constants
from these categories: Network, Core, Magic constants, Arrays, Filter,
URLs, Streams, Strings, Output Control.
* Removed duplicates and sorted.
* Break too long lines (>10k chars) so the entire file display properly in SmartGit.
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