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

Explanation

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.

Key points

Variable variables allow dynamic access to variable names.
Ambiguity arises when combining variable variables with array access.
Curly braces are the standard mechanism to resolve parsing ambiguity.

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