Configuration

XHP supports some configuration flags in php.ini. The most important is that you enable the extension via extension=xhp.so. After that’s done you can configure these other options:

xhp.idx_expr = {1 | 0} (default: 0): This is a bonus feature of XHP which adds support for the [] operator on the return value of a function. If you enable this you will be able to write code like foo()['bar'] without hitting syntax errors. This configuration is mainly around to fix a personal annoyance with PHP’s grammar, and has nothing to do with XHP’s core features.

xhp.include_debug = {1 | 0} (default: 1): You can disable XHP node annotations by turning this setting off. This may in some cases marginally increase performance of XHP-heavy code. It is highly recommended that you leave this on, as tracking errors in XHP applications is very difficult without annotations.