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InaccessibleProperty

Emitted when attempting to access a protected/private property from outside its available scope

<?php

class A {
    /** @return string */
    protected $foo;
}
echo (new A)->foo;

It is also emitted when writing to a property whose asymmetric set visibility (PHP 8.4) is not accessible from the current context:

<?php

class A {
    public private(set) string $foo = 'bar';
}

$a = new A();
$a->foo = 'baz';

It is also emitted when a readonly property is written anywhere but in a constructor (or __clone, unserialize) of its class:

<?php

class Test {}

class A {
    public function __construct(private readonly Test $test) {}

    public function change(Test $test): void {
        $this->test = $test; // InaccessibleProperty: A::$test is marked readonly
    }
}