[php-langspec][Issue #226] - Should `$a instanceof $b instanceof $c` be permitted in implementation/specification?

You can view the Issue on github:
https://github.com/php/php-langspec/issues/226

Comment by nikic:
For now, I've marked instanceof as left-associative in the spec, in order to reflect current reality: https://github.com/php/php-langspec/commit/15aa45273f4e5533ed252a612a5e6e7349a4d3ec