PHP - Detailed explanation of IteratorAggregate interface

PHP IteratorAggregate is also called an aggregate iterator. It provides an interface for creating external iterators. The interface summary is as follows:

IteratorAggregate extends Traversable {
	abstract public Traversable getIterator ( void )
}

When implementing the getIterator method, you must return an instance of a class that implements the Iterator interface.

Example description:

<?php
/**
 * 利用聚合式迭代器，并返回一个实现了Iterator接口的类的实例
 *
 * @author 疯狂老司机
 */
class myData implements IteratorAggregate {
    public $one = "Public property one";
    public $two = "Public property two";
    public $three = "Public property three";

    public function __construct() {
        $this->last = "last property";
    }

    public function getIterator() {
        return new ArrayIterator($this);
    }
}

$obj = new myData;

foreach($obj as $key => $value) {
    var_dump($key, $value);
    echo '<br>';// Linux：echo "\n";
}
?>

ArrayIterator iterator will encapsulate the object or array into a class that can be operated through foreach. The specific SPL iterator will be introduced in detail later.

The above introduces the detailed explanation of the PHP - IteratorAggregate interface, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.