Unset
-----
<?php

unset($a);
unset($b, $c);
-----
array(
    0: Stmt_Unset(
        vars: array(
            0: Expr_Variable(
                name: a
            )
        )
    )
    1: Stmt_Unset(
        vars: array(
            0: Expr_Variable(
                name: b
            )
            1: Expr_Variable(
                name: c
            )
        )
    )
)