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PHP 获取数组任意下标key的上一个prev和下一个next下标值
<?php
$xoops[1] = '小';
$xoops[2] = '孩';
$xoops[3] = '子';
$xoops[4] = '气';$steps = new Steps();foreach($xoops as $key=>$value){$steps->add($key);}$steps->setCurrent(3);//参数为key值
echo '上一个下标:'.$steps->getPrev()."<br />";
echo '指定的下标:'.$steps->getCurrent()."<br />";
echo '下一个下标:'.$steps->getNext()."<br />";class Steps {private $all;private $count;private $curr;function __construct() {$this->count = 0;}function add($step) {$this->count++;$this->all[$this->count] = $step;}function setCurrent($step) {reset($this->all);for ($i = 1; $i <= $this->count; $i++) {if ($this->all[$i] == $step)break;next($this->all);}$this->curr = current($this->all);}function getCurrent() {return $this->curr;}function getNext() {self::setCurrent($this->curr);return next($this->all);}function getPrev() {self::setCurrent($this->curr);return prev($this->all);}}
打印结果:
上一个下标:2
指定的下标:3
下一个下标:4
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