hack-utils

Type safe wrappers for PHP functions for usage with Hack, with the following objectives:

• Be completely and accurately statically typed
• Interoperate smoothly with PHP >= 5.3 via h2tp <src> <dst> --no-collections
• Prefer PHP arrays over Hack collections so the library is natural to use from PHP
• Where possible, provide simpler or more useful semantics than stock PHP APIs
  • Throw exceptions in the case of error instead of returning false or requiring the caller to check a _last_error() function
  • Use a consistent parameter order with the subject ($this if the function were a method) as the first parameter
• Cover the core set of functionality that common Hack/PHP programs require

The library functions like any other Composer package and does not require hhvm or h2tp to be installed to be used. When modifying this library, rebuild the PHP code with ./build.bash.

Functions are provided for

• strings (find, repeat, replace, slice, splice, chunk, trim, pad, reverse, split, join, is_alnum, ..., to/from hex, encode/decode utf8, ...)
• arrays, both associative and sequentially indexed (concat, push, pop, shift, unshift, range, filter, map, reduce, concat_map, group-by, combine, flip, transpose, union, intersect, diff, select, zip, unzip, reverse, shuffle, chunk, repeat, slice, splice, find, sort, ...)
• ints/floats (max, min, abs, ceil, floor, trunc, frac, round, signbit, exp, pow, log, sum, product, sin, cos, tan, sinh, ...)
• Date/Time (parse, format, get parts, from parts, ...)
• JSON (encode, decode)
• PCRE regular expressions (match, match all, split, replace, quote)

Browse the source code in the hack/ directory.

Functions have simple verbal names. Where a different use of the same verb is needed for different types (sequential array, associative array, string), the less common versions are suffixed with _string, _array or _assoc as appropriate. For example, chunk (for arrays), chunk_string, chunk_assoc.

Symbols prefixed with _ are private and should not be referenced from outside the library.

TODO:

• Filesystem (fopen, scandir, unlink, ...)
• Command execution (proc_open, ...)