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Array definitions
-----
<?php

array();
array('a');
array('a', );
array('a', 'b');
array('a', &$b, 'c' => 'd', 'e' => &$f);

// short array syntax
[];
[1, 2, 3];
['a' => 'b'];
-----
array(
    0: Expr_Array(
        items: array(
        )
    )
    1: Expr_Array(
        items: array(
            0: Expr_ArrayItem(
                key: null
                value: Scalar_String(
                    value: a
                )
                byRef: false
            )
        )
    )
    2: Expr_Array(
        items: array(
            0: Expr_ArrayItem(
                key: null
                value: Scalar_String(
                    value: a
                )
                byRef: false
            )
        )
    )
    3: Expr_Array(
        items: array(
            0: Expr_ArrayItem(
                key: null
                value: Scalar_String(
                    value: a
                )
                byRef: false
            )
            1: Expr_ArrayItem(
                key: null
                value: Scalar_String(
                    value: b
                )
                byRef: false
            )
        )
    )
    4: Expr_Array(
        items: array(
            0: Expr_ArrayItem(
                key: null
                value: Scalar_String(
                    value: a
                )
                byRef: false
            )
            1: Expr_ArrayItem(
                key: null
                value: Expr_Variable(
                    name: b
                )
                byRef: true
            )
            2: Expr_ArrayItem(
                key: Scalar_String(
                    value: c
                )
                value: Scalar_String(
                    value: d
                )
                byRef: false
            )
            3: Expr_ArrayItem(
                key: Scalar_String(
                    value: e
                )
                value: Expr_Variable(
                    name: f
                )
                byRef: true
            )
        )
    )
    5: Expr_Array(
        items: array(
        )
    )
    6: Expr_Array(
        items: array(
            0: Expr_ArrayItem(
                key: null
                value: Scalar_LNumber(
                    value: 1
                )
                byRef: false
            )
            1: Expr_ArrayItem(
                key: null
                value: Scalar_LNumber(
                    value: 2
                )
                byRef: false
            )
            2: Expr_ArrayItem(
                key: null
                value: Scalar_LNumber(
                    value: 3
                )
                byRef: false
            )
        )
    )
    7: Expr_Array(
        items: array(
            0: Expr_ArrayItem(
                key: Scalar_String(
                    value: a
                )
                value: Scalar_String(
                    value: b
                )
                byRef: false
            )
        )
    )
)

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