Online PHP editor | output for ehYQh

@ 2023-01-09T00:08:55Z

<?php

/**
 * @template T
 */
final class ReadonlyReference {
    /**
     * @param T $value
     */
    public function __construct(
        public readonly mixed $value
    ) {}
}

/**
 * @template T
 */
final class Reference {
    /**
     * @param T $value
     */
    public function __construct(
        public mixed $value
    ) {}
}

/**
 * @param ReadonlyReference<list<int>> $foo
 */
function foo(ReadonlyReference $foo): void {
    foreach($foo->value as $s) {
        var_dump($s);
    }
    
    $foo->value[] = 1;
}

$ref = new ReadonlyReference([
    1, 2, 3
]);

foo($ref);

Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: int(1) int(2) int(3) Fatal error: Uncaught Error: Cannot indirectly modify readonly property ReadonlyReference::$value in /in/ehYQh:35 Stack trace: #0 /in/ehYQh(42): foo(Object(ReadonlyReference)) #1 {main} thrown in /in/ehYQh on line 35
Process exited with code 255.
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.5 - 8.3.30: int(1) int(2) int(3) Fatal error: Uncaught Error: Cannot modify readonly property ReadonlyReference::$value in /in/ehYQh:35 Stack trace: #0 /in/ehYQh(42): foo(Object(ReadonlyReference)) #1 {main} thrown in /in/ehYQh on line 35
Process exited with code 255.
Output for 8.0.1 - 8.0.27: Parse error: syntax error, unexpected identifier "mixed", expecting variable in /in/ehYQh on line 11
Process exited with code 255.

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