PHP7 has removed a lot of the old cruft and made some small improvements to PHP's idiomatic syntax.
One great example is the removal of the mysql_real_escape_string function. http://php.net/manual/en/function.mysql-real-escape-string.p...
Another is finally giving us a null coalescing operator, which is a solution for a constant pain point in dealing with raw PHP POST and GET parameters.
The full "new features" list of PHP7: http://php.net/manual/en/migration70.new-features.php
The change log of PHP7+: http://php.net/ChangeLog-7.php