Comparison operators
-----
<?php
$a < $b;
$a <= $b;
$a > $b;
$a >= $b;
$a == $b;
$a === $b;
$a != $b;
$a !== $b;
$a instanceof B;
$a instanceof $b;
-----
array(
    0: Expr_Smaller(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    1: Expr_SmallerOrEqual(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    2: Expr_Greater(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    3: Expr_GreaterOrEqual(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    4: Expr_Equal(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    5: Expr_Identical(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    6: Expr_NotEqual(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    7: Expr_NotIdentical(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    8: Expr_Instanceof(
        expr: Expr_Variable(
            name: a
        )
        class: Name(
            parts: array(
                0: B
            )
        )
    )
    9: Expr_Instanceof(
        expr: Expr_Variable(
            name: a
        )
        class: Expr_Variable(
            name: b
        )
    )
)