PHP 循环遍历数据里中的内容

看起来你是想实现一个迭代器。

class InfiniteLoop implements Iterator {
    private $position = 0;
    private $array = array();
    private $latest_key = 0;

    public function __construct(array $array)
    {
        $this->position = 0;
        $this->array = $array;
        end($array);
        $this->latest_key = key($array);
    }

    function rewind(): void
    {
        $this->position = 0;
    }

    function current(): ?string
    {
        return $this->array[$this->position];
    }

    function key(): int
    {
        return $this->position;
    }

    function next(): void
    {
        if($this->position == $this->latest_key){
            $this->position = 0;
            return;
        }
        ++$this->position;
    }

    function valid(): bool
    {
        return isset($this->array[$this->position]);
    }

}

$array = array(1,2,3,4,5,6,7,8,9,10);

$arr = new InfiniteLoop($array);

$i = 0;
foreach($arr as $key => $value){
    $i++;

    if($i >= 100){
        break;
    }
    var_dump($key, $value);
}