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 “fixes” a “bug” in PHP’s grammar. PHP does not allow you to use the [] operator on the return value of a function. This is a senseless limitation which annoys developers and increases verbosity of code in some cases. If you enable this you will be able to write code like foo()['bar'] without hitting syntax errors.

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.