Which statement accurately describes the behavior of variable variables when accessing array properties?

Question

PHP Intermediate — Hard

Which statement accurately describes the behavior of variable variables when accessing array properties?

Accepted Answer

When using variable variables with arrays (e.g., $$a[1]), PHP encounters ambiguity: does it mean ${$a[1]} or ${$a}[1]? To resolve this, PHP requires the use of curly braces (e.g., ${$a}[1] or {$a[1]}) to explicitly define the intended order of operations. Without braces, the parser may interpret the expression in a way that leads to unexpected notices or errors.