isset()

isset()

function isset(mixed $var, ...$vars): bool

Determines whether a variable is set and is not null.

Parameters:

• $var (mixed)
• ...$vars — variadic: collects excess arguments into $vars.

Returns: bool

Availability

• Compiled (AOT): supported through a dedicated compiler language-construct path.
• eval() (magician interpreter): supported — declarative interpreter builtin (crates/elephc-magician/src/interpreter/builtins/symbols/isset.rs).

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

Internals

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