Pipe operator
-----
<?php
$a |> $b |> $c;
$a . $b |> $c . $d;
$a |> $b == $c;
$c == $a |> $b;
-----
array(
    0: Stmt_Expression(
        expr: Expr_BinaryOp_Pipe(
            left: Expr_BinaryOp_Pipe(
                left: Expr_Variable(
                    name: a
                )
                right: Expr_Variable(
                    name: b
                )
            )
            right: Expr_Variable(
                name: c
            )
        )
    )
    1: Stmt_Expression(
        expr: Expr_BinaryOp_Pipe(
            left: Expr_BinaryOp_Concat(
                left: Expr_Variable(
                    name: a
                )
                right: Expr_Variable(
                    name: b
                )
            )
            right: Expr_BinaryOp_Concat(
                left: Expr_Variable(
                    name: c
                )
                right: Expr_Variable(
                    name: d
                )
            )
        )
    )
    2: Stmt_Expression(
        expr: Expr_BinaryOp_Equal(
            left: Expr_BinaryOp_Pipe(
                left: Expr_Variable(
                    name: a
                )
                right: Expr_Variable(
                    name: b
                )
            )
            right: Expr_Variable(
                name: c
            )
        )
    )
    3: Stmt_Expression(
        expr: Expr_BinaryOp_Equal(
            left: Expr_Variable(
                name: c
            )
            right: Expr_BinaryOp_Pipe(
                left: Expr_Variable(
                    name: a
                )
                right: Expr_Variable(
                    name: b
                )
            )
        )
    )
)