PHP数组分页的最佳实现方式

<?php
function paginate($array, $page_number, $page_size) {
    // 计算要跳过的元素数量
    $offset = ($page_number - 1) * $page_size;
    // 提取指定范围的元素
    return array_slice($array, $offset, $page_size);
}

// 假设我们有一个包含 100 个元素的数组
$array = range(1, 100);

// 每页显示 10 个元素
$page_size = 10;
// 当前页码为 2
$page_number = 2;

// 获取第二页数据
$paginated_array = paginate($array, $page_number, $page_size);

// 打印分页后的数组
print_r($paginated_array);

<?php
class MyIterator implements Iterator {
    private $array;
    private $page_number;
    private $page_size;
    private $current_index;

    public function __construct($array, $page_number, $page_size) {
        $this->array = $array;
        $this->page_number = $page_number;
        $this->page_size = $page_size;
        $this->current_index = 0;
    }

    public function rewind() {
        $this->current_index = 0;
    }

    public function key() {
        return $this->current_index;
    }

    public function current() {
        return $this->array[$this->current_index];
    }

    public function next() {
        $this->current_index++;
    }

    public function valid() {
        return $this->current_index < $this->page_size;
    }
}

// 假设我们有一个包含 100 个元素的数组
$array = range(1, 100);

// 每页显示 10 个元素
$page_size = 10;
// 当前页码为 2
$page_number = 2;

// 创建迭代器
$iterator = new MyIterator($array, $page_number, $page_size);

// 遍历迭代器中的元素
foreach ($iterator as $element) {
    echo $element . "\n";
}