php-parser/test/code/expr/issetAndEmpty.test

isset() and empty()
-----
<?php
isset($a);
isset($a, $b, $c);

empty($a);
-----
array(
    0: Expr_Isset(
        vars: array(
            0: Expr_Variable(
                name: a
            )
        )
    )
    1: Expr_Isset(
        vars: array(
            0: Expr_Variable(
                name: a
            )
            1: Expr_Variable(
                name: b
            )
            2: Expr_Variable(
                name: c
            )
        )
    )
    2: Expr_Empty(
        var: Expr_Variable(
            name: a
        )
    )
)