PHP：迭代器(Iterator)接口实现

最新推荐文章于 2021-04-09 07:37:55 发布

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最新推荐文章于 2021-04-09 07:37:55 发布

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本文介绍了如何使用PHP实现一个自定义迭代器类，通过构造函数接收数组参数，并实现了rewind、current、key、next和valid等迭代器方法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

<?php

class MyIterator
implements Iterator

{

     private $var
= array();



     public function __construct($array)

     {

         if (is_array($array))
 {

            $this->var
= $array;

         }

     }



     public function rewind() {

         echo "rewindingn";

        reset($this->var);

     }



     public function current() {

        $var
= current($this->var);

         echo "current: $varn";

         return $var;

     }



     public function key() {

        $var
= key($this->var);

         echo "key: $varn";

         return $var;

     }



     public function next() {

        $var
= next($this->var);

         echo "next: $varn";

         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: $bn";

}

?>

The above example will output:

rewinding
current: 1
valid: 1
current: 1
key: 0
0: 1
next: 2
current: 2
valid: 1
current: 2

key: 1
1: 2
next: 3
current: 3
valid: 1
current: 3
key: 2
2: 3
next:
current:
valid: