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base on Userland typed array implementation # Strictly Typed Arrays in PHP 8
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[](https://packagist.org/packages/paragonie/typed-arrays)
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**Requires PHP 8.3**. This is best described through example:
```php
<?php
require_once 'vendor/autoload.php';
class Foo
{
public function __construct(
public readonly string⟦⟧ $foo,
public readonly int⟦⟧ $bar
) {}
}
$x = new Foo(
string⟦⟧('apple', 'bee'),
int⟦⟧(4, 5, 120000),
);
var_dump($x->foo, $x->bar);
var_dump($x->foo[1]);
```
This should output the following:
```
object(string⟦⟧)#5 (2) {
[0]=>
string(5) "apple"
[1]=>
string(3) "bee"
}
object(int⟦⟧)#6 (3) {
[0]=>
int(4)
[1]=>
int(5)
[2]=>
int(120000)
}
string(3) "bee"
```
If you try to pass an incorrect type, you'll get a `TypeError`:
```php
<?php
declare(strict_types=1);
require_once 'vendor/autoload.php';
class Foo
{
public function __construct(
public readonly string⟦⟧ $foo
) {}
}
$x = new Foo(
string⟦⟧('apple', 'bee', 25)
);
var_dump($x->foo, $x->bar);
```
Should produce:
```terminal
Fatal error: Uncaught TypeError: string⟦⟧(): Argument #3 must be of type string, int given
```
## What Is This Package Doing?
We are using Unicode characters (`⟦` and `⟧`) to create a class that implements `ArrayAccess`.
All arguments to these types are then strictly typed.
In effect, we have turned a class into a typed array that your IDE will not complain about.
## Does It Support Multi-Level Types? e.g. `string⟦⟧⟦⟧`
You betcha.
```php
<?php
declare(strict_types=1);
require_once 'vendor/autoload.php';
class Bar
{
public function __construct(
public readonly string⟦⟧⟦⟧ $double,
) {}
}
$test = new Bar(string⟦⟧⟦⟧(
string⟦⟧('test'),
string⟦⟧('example'),
));
var_dump($test->double);
```
This will produce:
```terminal
object(string⟦⟧⟦⟧)#7 (2) {
[0]=>
object(string⟦⟧)#5 (1) {
[0]=>
string(4) "test"
}
[1]=>
object(string⟦⟧)#6 (1) {
[0]=>
string(7) "example"
}
}
```
## Does This Support Arrays of Classes?
Of course!
```php
<?php
declare(strict_types=1);
require_once 'vendor/autoload.php';
class Foo {}
class Bar
{
public function __construct(
public readonly Foo⟦⟧ $example
) {}
}
$test = new Bar(new Foo⟦⟧(new Foo));
var_dump($test);
```
Output:
```terminal
object(Bar)#2 (1) {
["example"]=>
object(Foo⟦⟧)#5 (1) {
[0]=>
object(Foo)#6 (0) {
}
}
}
```
### How Does This Create Types for My Classes?
See: [the autoloader](global/autoloader.php).
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