# php2go

Convert PHP source code to Go by AST walking.

The goal is to produce idiomatic, maintainable Go code as part of a one-off conversion. This is not generally possible for highly dynamic PHP code, that may require manual fixups.

## Progress

[X] Convert some small programs
[X] All functions return `(type, error)`
	- [X] Convert `throw` to err return
	- [ ] Elide error return for functions that cannot throw
		- ?? Could be a standalone Go refactoring tool
	- [ ] Non-leaf function calls need to check + bubble errors
[ ] Comprehensive coverage of all AST node types
	- [ ] Expr
	- [ ] Binary
	- [ ] Scalar
	- [ ] ...
	- [ ] Convert instanceof for Exception types to Go1.13 `errors.Is`
[ ] Array handling
	- [ ] Infer whether to use slice/map for PHP array
	- [ ] Infer whether map use should be order-preserving
[ ] Multi-file programs
	- [ ] Include/Require
[ ] Namespaces
[ ] Generators
[X] Convert top-level calls to `init()`/`main()`
	- *Currently always `init`*
[ ] Class/object transformations
	- [X] Convert `new X` constructor calls to `NewX`
	- [ ] Convert class inheritance to interfaces with interface assertion
	- [ ] Traits / `use`
	- [ ] Abstract methods
[ ] Type inference
	- [ ] Parse extra types from phpdoc blocks
[ ] Infer whether to declare variable (`var` / `:=`) or reuse (`=`)
	- [ ] Track current visibility scope
[ ] Standard library transformations
	- [ ] Track golang package imports
	- [ ] Handle conflicts between golang stdlib packages / local variable names
[ ] PHP Superglobal transformations
	- [ ] `$_SERVER['argv']` to os.Args
	- [ ] `$_GET['name']` to r.FormValue('name')
[ ] Closures
	- [ ] Handle value/reference captures
[X] Variadic function parameters
[ ] Convert wordpress / mediawiki / symfony