array_multisort() — internals

array_multisort() — internals

Where it lives

• Signature: src/builtins/array/array_multisort.rs
• Lowering: src/codegen/lower_inst/builtins/arrays.rs:1719 (lower_array_multisort)
• Function symbol: lower_array_multisort()

Lowering notes

• Lowers array_multisort(): stable-sorts the first indexed array ascending and reorders the second
• in tandem, both in place. Both arguments are by-reference, so each is copy-on-write split with
• ensure_unique_sort_source and the (possibly relocated) pointer is written back to its local
• before the runtime mutates the storage. Returns true. Supports 8-byte scalar indexed arrays.

Runtime helpers

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

Signature summary

function array_multisort(array $array1, int $array2): bool

What the type checker enforces

• Arity: takes exactly 2 arguments.
• By-reference parameters: $array1, $array2.

Eval interpreter (magician)

Not callable from eval’d code — the magician interpreter has no entry for this builtin.

Cross-references

• User reference for array_multisort()