DownloadStrictly Typed Arrays in PHP 8
Requires PHP 8.3. This is best described through example:
<?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
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:
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
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:
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
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:
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.
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