Example
PSR-5 proposes a form of Generics-style notation for collections.
Generics Syntax
Type[]
Type<Type>
Type<Type[, Type]...>
Type<Type[|Type]...>
Values in a Collection MAY even be another array and even another Collection.
Type<Type<Type>>
Type<Type<Type[, Type]...>>
Type<Type<Type[|Type]...>>
Examples
<?php
/**
* @var ArrayObject<string> $name
*/
$name = new ArrayObject(['a', 'b']);
/**
* @var ArrayObject<int> $name
*/
$name = new ArrayObject([1, 2]);
/**
* @var ArrayObject<stdClass> $name
*/
$name = new ArrayObject([
new stdClass(),
new stdClass()
]);
/**
* @var ArrayObject<string|int|stdClass|bool> $name
*/
$name = new ArrayObject([
'a',
true,
1,
'b',
new stdClass(),
'c',
2
]);
/**
* @var ArrayObject<ArrayObject<int>> $name
*/
$name = new ArrayObject([
new ArrayObject([1, 2]),
new ArrayObject([1, 2])
]);
/**
* @var ArrayObject<int, string> $name
*/
$name = new ArrayObject([
1 => 'a',
2 => 'b'
]);
/**
* @var ArrayObject<string, int> $name
*/
$name = new ArrayObject([
'a' => 1,
'b' => 2
]);
/**
* @var ArrayObject<string, stdClass> $name
*/
$name = new ArrayObject([
'a' => new stdClass(),
'b' => new stdClass()
]);
