is_subclass_of() — internals

is_subclass_of() — internals

Where it lives

• Signature: src/builtins/callables/is_subclass_of.rs
• Lowering: src/codegen/lower_inst/builtins/types.rs:369 (lower_is_a_relation)
• Function symbol: lower_is_a_relation()

Lowering notes

• Lowers is_a() and is_subclass_of() for object operands and literal targets.

Runtime helpers

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

Signature summary

function is_subclass_of(mixed $object_or_class, string $class, bool $allow_string = true): bool

What the type checker enforces

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

Eval interpreter (magician)

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

Cross-references

• User reference for is_subclass_of()