ArrayShape

The attribute specifies possible array keys and their types.

If applied, an IDE will suggest the specified array keys, infer the specified types, and highlight non-specified keys in array access expressions.

Array shapes should be specified with the required $shape parameter whose values should be array literals.

Example:
#[ArrayShape(["f" => "int", "string", "x" => "float"])] This usage applied on an element effectively means that the array has 3 dimensions, the keys are "f", 1, and "x", and the corresponding types are "int", "string", and "float".