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Mathematical operators
-----
<?php

// unary ops
~$a;
+$a;
-$a;

// binary ops
$a & $b;
$a | $b;
$a ^ $b;
$a . $b;
$a / $b;
$a - $b;
$a % $b;
$a * $b;
$a + $b;
$a << $b;
$a >> $b;
$a ** $b;

// associativity
$a * $b * $c;
$a * ($b * $c);

// precedence
$a + $b * $c;
($a + $b) * $c;

// pow is special
$a ** $b ** $c;
($a ** $b) ** $c;
-----
array(
    0: Expr_BitwiseNot(
        expr: Expr_Variable(
            name: a
        )
        comments: array(
            0: // unary ops
        )
    )
    1: Expr_UnaryPlus(
        expr: Expr_Variable(
            name: a
        )
    )
    2: Expr_UnaryMinus(
        expr: Expr_Variable(
            name: a
        )
    )
    3: Expr_BinaryOp_BitwiseAnd(
        left: Expr_Variable(
            name: a
            comments: array(
                0: // binary ops
            )
        )
        right: Expr_Variable(
            name: b
        )
        comments: array(
            0: // binary ops
        )
    )
    4: Expr_BinaryOp_BitwiseOr(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    5: Expr_BinaryOp_BitwiseXor(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    6: Expr_BinaryOp_Concat(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    7: Expr_BinaryOp_Div(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    8: Expr_BinaryOp_Minus(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    9: Expr_BinaryOp_Mod(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    10: Expr_BinaryOp_Mul(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    11: Expr_BinaryOp_Plus(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    12: Expr_BinaryOp_ShiftLeft(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    13: Expr_BinaryOp_ShiftRight(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    14: Expr_BinaryOp_Pow(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    15: Expr_BinaryOp_Mul(
        left: Expr_BinaryOp_Mul(
            left: Expr_Variable(
                name: a
                comments: array(
                    0: // associativity
                )
            )
            right: Expr_Variable(
                name: b
            )
            comments: array(
                0: // associativity
            )
        )
        right: Expr_Variable(
            name: c
        )
        comments: array(
            0: // associativity
        )
    )
    16: Expr_BinaryOp_Mul(
        left: Expr_Variable(
            name: a
        )
        right: Expr_BinaryOp_Mul(
            left: Expr_Variable(
                name: b
            )
            right: Expr_Variable(
                name: c
            )
        )
    )
    17: Expr_BinaryOp_Plus(
        left: Expr_Variable(
            name: a
            comments: array(
                0: // precedence
            )
        )
        right: Expr_BinaryOp_Mul(
            left: Expr_Variable(
                name: b
            )
            right: Expr_Variable(
                name: c
            )
        )
        comments: array(
            0: // precedence
        )
    )
    18: Expr_BinaryOp_Mul(
        left: Expr_BinaryOp_Plus(
            left: Expr_Variable(
                name: a
            )
            right: Expr_Variable(
                name: b
            )
        )
        right: Expr_Variable(
            name: c
        )
    )
    19: Expr_BinaryOp_Pow(
        left: Expr_Variable(
            name: a
            comments: array(
                0: // pow is special
            )
        )
        right: Expr_BinaryOp_Pow(
            left: Expr_Variable(
                name: b
            )
            right: Expr_Variable(
                name: c
            )
        )
        comments: array(
            0: // pow is special
        )
    )
    20: Expr_BinaryOp_Pow(
        left: Expr_BinaryOp_Pow(
            left: Expr_Variable(
                name: a
            )
            right: Expr_Variable(
                name: b
            )
        )
        right: Expr_Variable(
            name: c
        )
    )
)