PHP Collections


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()
]);