PHP Factory mode PHP design mode iterator mode

The definition of the PHP iterator pattern is to traverse the inner element of an aggregated object without exposing the internal representation of the object without knowing the inner implementation.

Applicable scenarios:
Access the contents of an aggregated object without exposing its internal representation
Support for multiple traversal of aggregated objects
Provides a unified interface for traversing different aggregation structures

Iterator Pattern instance:

<?phpclass Concreteiterator implements iterator{private $position = 0; private $arr; function __construct (array $arr) { $this->arr = $arr; } function Rewind () {$this->position = 0;} function current () {return $this->arr[$this->position];} function ke Y () {return $this->position;} function Next () {+ + $this->position;} function valid () {return isset ($this->arr[$ This->position]); }} $arr = Array (' Xiao Hong ', ' Xiao Ming ', ' Xiaohua '); $concreteIterator = new Concreteiterator ($arr); foreach ($ Concreteiterator as $key = $value) {echo $key. = ". $value." \ n ";}

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