Negative expression formats as functionally different code

[bayruns]

Prettier 3.8.1
PHP Plugin 0.25.0

Options:

--parser php

Input:

<?php

$Y = 1;
$X = -$Y - 1;

Output:

<php

$Y = 1;
$X = -($Y - 1);

Expected behavior:

Prettier should preserve semantics. These two expressions are not equivalent:

-$Y - 1

-($Y - 1)

For example:

<?php

$Y = 1;

$a = -$Y - 1;      // -2
$b = -($Y - 1);    // 0

var_dump($a, $b);

This outputs:

int(-2)
int(0)

So the transformation performed by Prettier changes the behavior of the code.

Additional context:

• Reproduced with prettier@3.8.1 and @prettier/plugin-php@0.25.0
• PHP version setting: 8.4
• Reproduced via CLI with:

npx prettier example.php --parser php --plugin=@prettier/plugin-php

This appears to be an incorrect rewrite involving unary minus and binary subtraction precedence.