Best way to implement array pagination in PHP

PHP There are two most common ways to paginate arrays: using the array_slice() function: calculate the number of elements to skip, and then extract the specified range of elements. Use built-in iterators: Implement the Iterator interface, and the rewind(), key(), current(), next(), and valid() methods are used to iterate over the elements in the specified range.

The best way to implement array paging in PHP

Paging is a common requirement in Web development. It allows users to divide multiple Page to view the elements in the dataset. There are several ways to implement pagination for PHP arrays. This article will introduce the two most common implementation methods and provide practical cases.

Method 1: Use the array_slice() function

array_slice() The function can be used to extract a specified range of elements from an array. The steps to implement paging are as follows:

<?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);

Method 2: Use built-in iterator

PHP provides a built-in Iterator interface that can be used to traverse arrays elements in . The steps to implement paging are as follows:

<?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";
}

According to your specific needs, you can choose to use the array_slice() function or built-in iterator to implement paging.

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