How to implement array paging function in php

In PHP language programming development, the paging function is a common requirement, especially when processing large amounts of data. In order to improve the efficiency and user experience of the website, it is very necessary to paginate the query results. For array type data, PHP also provides related functions and methods to implement array paging.

1. The basic idea of ​​implementing array paging

The basic idea of ​​implementing array paging in PHP is: by calculating the total number of data and the number of data entries displayed on each page, determine the total number of pages, and then based on The current page number calculates the starting position and ending position of the current data, and finally returns an array of page_size data.

2. Use the array_slice() function to implement array paging

The array_slice() function is used to select a specified number of elements starting from a certain position in the array and form them into a new array. return. This function can be used to cut an existing array and return an array of specified length as paging data.

Sample code:

<?php
// $arr为原始数组，$page为当前页码，$page_size为每页显示数据条目数
function page_array($arr, $page=1, $page_size=10) {
    $total = count($arr); // 计算数组总数
    $total_page = ceil($total / $page_size); // 计算总页数
    $offset = ($page - 1) * $page_size;     // 计算当前数据起始位置
    $page_arr = array_slice($arr, $offset, $page_size); // 从原数组中截取$page_size个数据作为当前页数据
    return array(
        &#39;page_arr&#39; => $page_arr,   // 分页数据
        'total_page' => $total_page, // 总页数
        'total' => $total,   // 总记录数
        'page' => $page,     // 当前页码
        'page_size' => $page_size   // 每页数据条目数
    );
}

3. Use the array_chunk() function to implement array paging

The array_chunk() function is used to split an array into multiple array chunks, each Arrays have a specified $size size. Using this function, you can also easily implement array paging function.

Sample code:

<?php
// $arr为原始数组，$page为当前页码，$page_size为每页显示数据条目数
function page_array($arr, $page=1, $page_size=10) {
    $total = count($arr); // 计算数组总数
    $total_page = ceil($total / $page_size); // 计算总页数
    $page_arr = array_chunk($arr, $page_size, true); // 将原数组分割成$page_size个元素的子数组
    $page_arr = isset($page_arr[$page - 1]) ? $page_arr[$page - 1] : array(); // 获取当前页数据
    return array(
        &#39;page_arr&#39; => $page_arr,   // 分页数据
        'total_page' => $total_page, // 总页数
        'total' => $total,   // 总记录数
        'page' => $page,     // 当前页码
        'page_size' => $page_size   // 每页数据条目数
    );
}

4. Targeted optimization

In practical applications, array paging sometimes needs to be optimized in combination with other conditions to meet different needs. For example:

1. Paging based on sorting conditions

After sorting a large array, paging needs to be done based on the sorting results. When implementing array sorting, PHP provides functions such as sort(), rsort(), asort(), arsort(), ksort(), krsort(), etc. Among them, the sort() and rsort() functions are used to sort values. For sorting, the asort() and arsort() functions are used to sort key-value pairs, and the ksort() and krsort() functions are used to sort key names.

2. Paging based on keywords

If there are certain keywords or data types and other information in the array, you can use strpos(), strstr(), array_search when paging () and other functions to search, and then perform paging.

3. Dynamicly set the number of data entries per page

Sometimes, the page needs to dynamically set the number of data entries per page based on the user's selection in real time. At this time, you need to set $page_size as a variable, and pass and modify the value of the variable through forms, drop-down boxes, etc. on the front-end page.

In short, for different application scenarios and needs, the above ideas and sample codes can be customized to modify and improve to achieve a more flexible and efficient array paging function.

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