Iterator Pattern(迭代器模式）

 php已经有Iterator接口对应着迭代器模式

<?php class MyIterator implements Iterator { private $var = array(); public function __construct($array) { if (is_array($array)) { $this->var = $array; } } public function rewind() { echo "rewinding/n"; reset($this->var); } public function current() { $var = current($this->var); echo "current: $var/n"; return $var; } public function key() { $var = key($this->var); echo "key: $var/n"; return $var; } public function next() { $var = next($this->var); echo "next: $var/n"; return $var; } public function valid() { $var = $this->current() !== false; echo "valid: {$var}/n"; return $var; } } $values = array(1,2,3); $it = new MyIterator($values); foreach ($it as $a => $b) { print "$a: $b/n"; }  

参考：http://c2.com/cgi/wiki?IteratorPattern