PHP设计模式系列 - 迭代器

    <?php    
    //迭代器：可帮助构造特定的对象，那些对象能够提供单一标准接口循环或迭代任何类型的可计数数据  
    class MyIterator implements Iterator {     
          
        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 function valid() {      
            $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‘);  
    $it = new MyIterator($values);  
    foreach ($it as $a => $b) {   
        print "$a: $b<br>";    
    }  
    ?>