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Date: Mon, 16 Nov 2015 09:15:41 +0000
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Subject: [PHP-DEV] Immutable modifier
From: t.carnage@gmail.com (Chris Riley)

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Hi,

There has been a lot of interest recently (eg psr-7) in immutable data. I'm
considering putting an RFC together to add language support for immutables:

immutable class Foo {
public $bar;
public function __construct($bar) {
$this->bar = $bar;
}
}

Immutable on a class declaration makes all (maybe only public?) properties
of the class immutable after construct; assigning to a property would
result in a Fatal error.

class Foo {
public $bar;
immutable public $baz;
}

Immutable on a property makes the property immutable once it takes on a
none null value. Attempts to modify the property after this results in a
fatal error.

Any thoughts?
~C

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