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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;

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

// precedence
$a + $b * $c;
($a + $b) * $c;
-----
array(
    0: Expr_BitwiseNot(
        expr: Expr_Variable(
            name: a
        )
    )
    1: Expr_UnaryPlus(
        expr: Expr_Variable(
            name: a
        )
    )
    2: Expr_UnaryMinus(
        expr: Expr_Variable(
            name: a
        )
    )
    3: Expr_BitwiseAnd(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    4: Expr_BitwiseOr(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    5: Expr_BitwiseXor(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    6: Expr_Concat(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    7: Expr_Div(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    8: Expr_Minus(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    9: Expr_Mod(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    10: Expr_Mul(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    11: Expr_Plus(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    12: Expr_ShiftLeft(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    13: Expr_ShiftRight(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Variable(
            name: b
        )
    )
    14: Expr_Mul(
        left: Expr_Mul(
            left: Expr_Variable(
                name: a
            )
            right: Expr_Variable(
                name: b
            )
        )
        right: Expr_Variable(
            name: c
        )
    )
    15: Expr_Mul(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Mul(
            left: Expr_Variable(
                name: b
            )
            right: Expr_Variable(
                name: c
            )
        )
    )
    16: Expr_Plus(
        left: Expr_Variable(
            name: a
        )
        right: Expr_Mul(
            left: Expr_Variable(
                name: b
            )
            right: Expr_Variable(
                name: c
            )
        )
    )
    17: Expr_Mul(
        left: Expr_Plus(
            left: Expr_Variable(
                name: a
            )
            right: Expr_Variable(
                name: b
            )
        )
        right: Expr_Variable(
            name: c
        )
    )
)

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