Alternative array syntax
-----
<?php

$a{'b'};
$a{'b'}();
$a->b{'c'};
$a->b(){'c'};
A::$b{'c'};
A{0};
A::B{0};
new $array{'className'};
new $a->b{'c'}();
-----
!!version=7.4
array(
    0: Stmt_Expression(
        expr: Expr_ArrayDimFetch(
            var: Expr_Variable(
                name: a
            )
            dim: Scalar_String(
                value: b
            )
        )
    )
    1: Stmt_Expression(
        expr: Expr_FuncCall(
            name: Expr_ArrayDimFetch(
                var: Expr_Variable(
                    name: a
                )
                dim: Scalar_String(
                    value: b
                )
            )
            args: array(
            )
        )
    )
    2: Stmt_Expression(
        expr: Expr_ArrayDimFetch(
            var: Expr_PropertyFetch(
                var: Expr_Variable(
                    name: a
                )
                name: Identifier(
                    name: b
                )
            )
            dim: Scalar_String(
                value: c
            )
        )
    )
    3: Stmt_Expression(
        expr: Expr_ArrayDimFetch(
            var: Expr_MethodCall(
                var: Expr_Variable(
                    name: a
                )
                name: Identifier(
                    name: b
                )
                args: array(
                )
            )
            dim: Scalar_String(
                value: c
            )
        )
    )
    4: Stmt_Expression(
        expr: Expr_ArrayDimFetch(
            var: Expr_StaticPropertyFetch(
                class: Name(
                    name: A
                )
                name: VarLikeIdentifier(
                    name: b
                )
            )
            dim: Scalar_String(
                value: c
            )
        )
    )
    5: Stmt_Expression(
        expr: Expr_ArrayDimFetch(
            var: Expr_ConstFetch(
                name: Name(
                    name: A
                )
            )
            dim: Scalar_Int(
                value: 0
            )
        )
    )
    6: Stmt_Expression(
        expr: Expr_ArrayDimFetch(
            var: Expr_ClassConstFetch(
                class: Name(
                    name: A
                )
                name: Identifier(
                    name: B
                )
            )
            dim: Scalar_Int(
                value: 0
            )
        )
    )
    7: Stmt_Expression(
        expr: Expr_New(
            class: Expr_ArrayDimFetch(
                var: Expr_Variable(
                    name: array
                )
                dim: Scalar_String(
                    value: className
                )
            )
            args: array(
            )
        )
    )
    8: Stmt_Expression(
        expr: Expr_New(
            class: Expr_ArrayDimFetch(
                var: Expr_PropertyFetch(
                    var: Expr_Variable(
                        name: a
                    )
                    name: Identifier(
                        name: b
                    )
                )
                dim: Scalar_String(
                    value: c
                )
            )
            args: array(
            )
        )
    )
)
-----
<?php

$a{'b'};
$a{'b'}();
$a->b{'c'};
$a->b(){'c'};
A::$b{'c'};
A{0};
A::B{0};
new $array{'className'};
new $a->b{'c'}();
-----
Syntax error, unexpected '{' from 3:3 to 3:3
Syntax error, unexpected '{' from 4:3 to 4:3
Syntax error, unexpected '{' from 5:6 to 5:6
Syntax error, unexpected '{' from 6:8 to 6:8
Syntax error, unexpected '{' from 7:6 to 7:6
Syntax error, unexpected '{' from 8:2 to 8:2
Syntax error, unexpected '{' from 9:5 to 9:5
Syntax error, unexpected '{' from 10:11 to 10:11
Syntax error, unexpected '{' from 11:10 to 11:10
array(
    0: Stmt_Expression(
        expr: Expr_Variable(
            name: a
        )
    )
    1: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_String(
                    value: b
                )
            )
        )
    )
    2: Stmt_Expression(
        expr: Expr_Variable(
            name: a
        )
    )
    3: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_String(
                    value: b
                )
            )
        )
    )
    4: Stmt_Expression(
        expr: Expr_PropertyFetch(
            var: Expr_Variable(
                name: a
            )
            name: Identifier(
                name: b
            )
        )
    )
    5: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_String(
                    value: c
                )
            )
        )
    )
    6: Stmt_Expression(
        expr: Expr_MethodCall(
            var: Expr_Variable(
                name: a
            )
            name: Identifier(
                name: b
            )
            args: array(
            )
        )
    )
    7: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_String(
                    value: c
                )
            )
        )
    )
    8: Stmt_Expression(
        expr: Expr_StaticPropertyFetch(
            class: Name(
                name: A
            )
            name: VarLikeIdentifier(
                name: b
            )
        )
    )
    9: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_String(
                    value: c
                )
            )
        )
    )
    10: Stmt_Expression(
        expr: Expr_ConstFetch(
            name: Name(
                name: A
            )
        )
    )
    11: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_Int(
                    value: 0
                )
            )
        )
    )
    12: Stmt_Expression(
        expr: Expr_ClassConstFetch(
            class: Name(
                name: A
            )
            name: Identifier(
                name: B
            )
        )
    )
    13: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_Int(
                    value: 0
                )
            )
        )
    )
    14: Stmt_Expression(
        expr: Expr_New(
            class: Expr_Variable(
                name: array
            )
            args: array(
            )
        )
    )
    15: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_String(
                    value: className
                )
            )
        )
    )
    16: Stmt_Expression(
        expr: Expr_New(
            class: Expr_PropertyFetch(
                var: Expr_Variable(
                    name: a
                )
                name: Identifier(
                    name: b
                )
            )
            args: array(
            )
        )
    )
    17: Stmt_Block(
        stmts: array(
            0: Stmt_Expression(
                expr: Scalar_String(
                    value: c
                )
            )
        )
    )
)