strrpos() — internals

strrpos() — internals

Where it lives

• Signature: src/builtins/string/strrpos.rs
• Lowering: src/codegen/lower_inst/builtins/strings.rs:762 (lower_string_position)
• Function symbol: lower_string_position()

Lowering notes

• Lowers strpos()/strrpos() and boxes position-or-false results as Mixed.

Runtime helpers

No direct __rt_* helpers captured — the lowering is inlined or routes through another builtin.

Signature summary

function strrpos(string $haystack, string $needle, int $offset = 0): mixed

What the type checker enforces

• Arity: takes 2–3 arguments (1 optional).

Eval interpreter (magician)

• Declaration: crates/elephc-magician/src/interpreter/builtins/string/strrpos.rs (eval_builtin!)
• Dispatch hooks: direct, values

Cross-references

• User reference for strrpos()