1--TEST--
2Modifying a readonly property
3--FILE--
4<?php
5
6class Test {
7    readonly public int $prop;
8    readonly public array $prop2;
9
10    public function __construct() {
11        // Initializing assignments.
12        $this->prop = 1;
13        $this->prop2 = [];
14    }
15}
16
17function byRef(&$ref) {}
18
19$test = new Test;
20var_dump($test->prop); // Read.
21try {
22    $test->prop = 2;
23} catch (Error $e) {
24    echo $e->getMessage(), "\n";
25}
26try {
27    $test->prop += 1;
28} catch (Error $e) {
29    echo $e->getMessage(), "\n";
30}
31try {
32    $test->prop++;
33} catch (Error $e) {
34    echo $e->getMessage(), "\n";
35}
36try {
37    ++$test->prop;
38} catch (Error $e) {
39    echo $e->getMessage(), "\n";
40}
41try {
42    $ref =& $test->prop;
43} catch (Error $e) {
44    echo $e->getMessage(), "\n";
45}
46try {
47    $test->prop =& $ref;
48} catch (Error $e) {
49    echo $e->getMessage(), "\n";
50}
51try {
52    byRef($test->prop);
53} catch (Error $e) {
54    echo $e->getMessage(), "\n";
55}
56
57var_dump($test->prop2); // Read.
58try {
59    $test->prop2[] = 1;
60} catch (Error $e) {
61    echo $e->getMessage(), "\n";
62}
63try {
64    $test->prop2[0][] = 1;
65} catch (Error $e) {
66    echo $e->getMessage(), "\n";
67}
68
69?>
70--EXPECT--
71int(1)
72Cannot modify readonly property Test::$prop
73Cannot modify readonly property Test::$prop
74Cannot modify readonly property Test::$prop
75Cannot modify readonly property Test::$prop
76Cannot modify readonly property Test::$prop
77Cannot modify readonly property Test::$prop
78Cannot modify readonly property Test::$prop
79array(0) {
80}
81Cannot modify readonly property Test::$prop2
82Cannot modify readonly property Test::$prop2
83