session_id()

session_id()

function session_id(?string $id = null): mixed

Implemented by the compiler-injected web prelude.

Parameters:

• $id (?string), default null, optional

Returns: mixed

Availability

• Compiled (AOT): supported through an injected elephc-PHP prelude.
• eval() (magician interpreter): not available inside eval’d code.

No examples yet — check examples/ and showcases/ for usage patterns.

Internals

For how session_id is implemented in the compiler, see the internals page.