PHP Design Pattern Series-iterators

• PHP iterators:

can help construct specific objects that can provide a single standard interface loop or iterate over any type of data that can be counted. (not particularly common in PHP)

• Usage scenarios:

1. Access the contents of an aggregated object without exposing its internal representation.

2. Support for multiple traversal of aggregation objects.

3. Provides a unified interface for traversing different aggregation structures (that is, polymorphic iterations).

PHP Code implementation:

<?PHP//iterators: Can help construct specific objects that can provide a single standard interface loop or iterate over any type of data that can be counted    classMyiteratorImplementsIterator {Private $var=Array();  Public function__construct ($array) {                  $this-var=$array; }                     Public function Rewind() {                   Reset($this-var); }                     Public function  Current() {                 $var= Current($this-var); return $var; }                      Public functionvalid () {$var=$this- Current() !==false; return $var; }                     Public function Next() {                  $var=Next($this-var); return $var; }                     Public function Key() {                  $var=Key($this-var); return $var; }      }      $values=Array(' A ', ' B ', ' C '); $it=NewMyiterator ($values); foreach($it  as $a=$b) {           Print"$a:$b<br> "; }      ?>

From: http://blog.csdn.net/initphp/article/details/7693576

PHP Design Pattern Series-iterators