Built-in Functions · RHP Docs · RHP Programming Language

Reserved Compiler Intrinsics

To eliminate global namespace pollution while preserving convenient developer shorthand, the Pratt parser automatically intercepts reserved intrinsics and lowers them to static Sys::* facade calls:

Shorthand Call	Lowered AST Node	Description
`echo("text", ...$args)`	`Sys::echo("text", ...$args)`	Directly compiles to Rust `print!()` (stdout without trailing newline)
`print("text", ...$args)`	`Sys::print("text", ...$args)`	Directly compiles to Rust `println!()` (stdout WITH trailing newline `\n`)
`env('KEY', 'default')`	`Sys::env('KEY', 'default')`	Read system environment variable
`dd($val1, $val2)`	`Sys::dd($val1, $val2)`	Dump variables and terminate execution

Formatting Engine & Parameters: Both Sys::echo and Sys::print directly map to Rust function calls (print! and println!) with function parameters passed as-is. RHP does not support C-style formatting (%d, %s, %f, %x, etc.). Use native Rust placeholders such as {}, {:.2} (floating-point precision), {:05} (zero padding), {:x} (hexadecimal), and {:b} (binary).

Note on Sys::println: There is no Sys::println function in RHP. Only echo (inline, no newline) and print (with trailing newline) exist in the language and via the Sys facade (Sys::echo and Sys::print). Calling Sys::println(...) produces an UndefinedFacadeMethod error.

Legacy PHP Function Lowering (`phpFun::*`)

For backward compatibility with legacy codebases, standard PHP function invocations are recognized via a compile-time static registry and automatically lowered into corresponding RHP facade methods:

Legacy Function Call	Lowered Expression	Target Facade Implementation
`array_merge($a, $b)`	`phpFun::array_merge($a, $b)`	`Arr::merge($a, $b)`
`strlen($str)`	`phpFun::strlen($str)`	`Str::byteLength($str)`
`implode($glue, $arr)`	`phpFun::implode($glue, $arr)`	`Arr::implode($glue, $arr)`
`file_get_contents($path)`	`phpFun::file_get_contents($path)`	`File::read($path)`
`file_put_contents($path, $data)`	`phpFun::file_put_contents($path, $data)`	`File::write($path, $data)`

Dynamic Global Helpers (`Glob::*`)

Any unrecognized global function call that is not defined in userland is routed through the Glob fallback container:

// Pratt parser lowering fallback:
Expr::static_call("Glob", "customHelper", vec![callee_name, ...args])

Reserved Compiler Intrinsics

Legacy PHP Function Lowering (phpFun::*)

Dynamic Global Helpers (Glob::*)

Legacy PHP Function Lowering (`phpFun::*`)

Dynamic Global Helpers (`Glob::*`)