class CustomIterator implements Iterator { private $_data; private $_index = 0; public function __construct($data) { $this->_data = $data; } /** * 返回当前指针指向的元素 * @return mixed */ public function current() { return $this->_data[$this->_index]; } /** * 指针向前推一位 */ public function next() { $this->_index ++; } /** * 重置指针,将指针指向第一个元素 */ public function rewind() { $this->_index = 0; } /** * 返回当前指针位置 * @return int|mixed */ public function key() { return $this->_index; } /** * 检测指针当前指向是否有效 * @return bool */ public function valid() { return count($this->_data) > $this->_index; } } $data = array( ['name' => 'zhangsan', 'age' => 12, 'career' => 'engineer'], ['name' => 'lisi', 'age' => 12, 'career' => 'engineer'], ['name' => 'waner', 'age' => 12, 'career' => 'engineer'], ['name' => 'faguan', 'age' => 12, 'career' => 'engineer'], ); $obj = new CustomIterator($data); echo '<pre>'; foreach ($obj as $key => $user) { print_r($user); } echo '---------------------------------------------------<br>'; // 重置指针,相当于数组里的reset()方法 $obj->rewind(); while ($obj->valid()) { print_r($obj->current()); $obj->next(); }
结果:
Array ( [name] => zhangsan [age] => 12 [career] => engineer ) Array ( [name] => lisi [age] => 12 [career] => engineer ) Array ( [name] => waner [age] => 12 [career] => engineer ) Array ( [name] => faguan [age] => 12 [career] => engineer ) --------------------------------------------------- Array ( [name] => zhangsan [age] => 12 [career] => engineer ) Array ( [name] => lisi [age] => 12 [career] => engineer ) Array ( [name] => waner [age] => 12 [career] => engineer ) Array ( [name] => faguan [age] => 12 [career] => engineer )