Type hints
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<?php

function a($b, array $c, callable $d, E $f) {}
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array(
    0: Stmt_Function(
        byRef: false
        name: a
        params: array(
            0: Param(
                type: null
                byRef: false
                variadic: false
                name: b
                default: null
            )
            1: Param(
                type: array
                byRef: false
                variadic: false
                name: c
                default: null
            )
            2: Param(
                type: callable
                byRef: false
                variadic: false
                name: d
                default: null
            )
            3: Param(
                type: Name(
                    parts: array(
                        0: E
                    )
                )
                byRef: false
                variadic: false
                name: f
                default: null
            )
        )
        returnType: null
        stmts: array(
        )
    )
)