PHPは配列の任意の下付きキーの前のprevと次のnext下付き値を取得する
1356 ワード
PHPは配列の任意の下付きキーの前のprevと次のnext下付き値を取得する
印刷結果:
$value){
$steps->add($key);
}
$steps->setCurrent(3);// key
echo ' :'.$steps->getPrev()."
";
echo ' :'.$steps->getCurrent()."
";
echo ' :'.$steps->getNext()."
";
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);
}
}
印刷結果:
:2
:3
:4