PHP-Parser/test/code/expr/variable.test

Variable syntaxes
-----
<?php

$a;
${'a'};
${foo()};
$$b;
$$$c;
-----
array(
    0: Expr_Variable(
        name: a
    )
    1: Expr_Variable(
        name: Scalar_String(
            value: a
        )
    )
    2: Expr_Variable(
        name: Expr_FuncCall(
            name: Name(
                parts: array(
                    0: foo
                )
            )
            args: array(
            )
        )
    )
    3: Expr_Variable(
        name: Expr_Variable(
            name: b
        )
    )
    4: Expr_Variable(
        name: Expr_Variable(
            name: Expr_Variable(
                name: c
            )
        )
    )
)