array_key_first() — internals

array_key_first() — internals

Where it lives

• Signature: src/builtins/array/array_key_first.rs
• Lowering: src/codegen/lower_inst/builtins/arrays.rs:1161 (lower_array_key_first)
• Function symbol: lower_array_key_first()

Lowering notes

• Lowers array_key_first() through the shared edge-key helper with selector 0.

Runtime helpers

The following runtime helpers are referenced:

• __rt_array_edge_key
• __rt_mixed_from_value

Signature summary

function array_key_first(array $array): mixed

What the type checker enforces

• Arity: takes exactly 1 argument.

Eval interpreter (magician)

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

Cross-references

• User reference for array_key_first()