dumbo/vendor/nikic/php-parser/test/code/parser/stmt/function/byRef.test

Return and pass by ref
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<?php

function a(&$b) {}
function &a($b) {}
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array(
    0: Stmt_Function(
        byRef: false
        params: array(
            0: Param(
                name: b
                default: null
                type: null
                byRef: true
            )
        )
        stmts: array(
        )
        name: a
    )
    1: Stmt_Function(
        byRef: true
        params: array(
            0: Param(
                name: b
                default: null
                type: null
                byRef: false
            )
        )
        stmts: array(
        )
        name: a
    )
)