分页类--兄弟会倡哥

<?php  
namespace App\Tools;

/**
 * 自定义分页类,主要用于产生分页试图
 * Class Common
 * @package App\Library
 */
class CustomPage  
{
    /**
     * @param $text
     * @return string
     */
    public static function getActivePageWrapper($text)
    {
        return '<li><span>' . $text . '</span></li>';
    }

    /**
     * 获取当前页按钮的页面样式
     * @param $url
     * @param $page
     * @return string
     */
    public static function getActivePageLinkWrapper($url, $page)
    {
        return '<li class="active"><a href="' . $url . '">' . $page . '</a></li>';
    }

    /**
     * 获取非当前页按钮的页面样式
     * @param $url
     * @param $page
     * @return string
     */
    public static function getPageLinkWrapper($url, $page)
    {
        return '<li><a href="' . $url . '">' . $page . '</a></li>';
    }

    /**
     * 获取整个的分页样式
     * @param $nowPage 当前页
     * @param $totalPage 共多少页面
     * @param $baseUrl  当前url
     * @param $search   搜索
     * @return string
     */
public static function getSelfPageView($nowPage, $totalPage, $baseUrl, $search)
{

    $pagePre = '<ul class="pagination">';
    $pageEnd = '</ul>';

    $pageLastStr = '';
    $pageNextStr = '';
    if ($nowPage <= 1) {
        $nowPage = 1;
        $pageLastStr = '<li class="disabled"><span>«</span></li>';
    }
    if ($nowPage >= $totalPage) {
        $nowPage = $totalPage;
        $pageNextStr = '<li class="disabled"><span>»</span></li>';
    }

    $search['totalPage'] = $totalPage;

    if (empty($pageLastStr)) {
        $lastPage = $nowPage - 1;
        $search['nowPage'] = $lastPage;
        $lastSearchStr = self::arrayToSearchStr($search);
        $url = $baseUrl . '?' . $lastSearchStr;
        $pageLastStr = self::getPageLinkWrapper($url, '«');
    }

    if (empty($pageNextStr)) {
        $pageNext = $nowPage + 1;
        $search['nowPage'] = $pageNext;
        $lastSearchStr = self::arrayToSearchStr($search);
        $url = $baseUrl . '?' . $lastSearchStr;
        $pageNextStr = self::getPageLinkWrapper($url, '»');
    }

    $pageTemp = '';
    $pageRange = self::getPageRange($nowPage, $totalPage);
    $pageTemp .= $pageLastStr;
    foreach ($pageRange as $page) {
        $search['nowPage'] = $page;
        $searchStr = self::arrayToSearchStr($search);
        $url = $baseUrl . '?' . $searchStr;
        if ($page == $nowPage) {
            $pageTemp .= self::getActivePageLinkWrapper($url, $page);
        } else {
            $pageTemp .= self::getPageLinkWrapper($url, $page);
        }
    }
    $pageTemp .= $pageNextStr;
    $pageView = $pagePre . $pageTemp . $pageEnd;
    return $pageView;
}

/**
 * 获取实际显示页面范围的范围
 * @param $nowPage
 * @param $totalPage
 * @return array
 */
public static function getPageRange($nowPage, $totalPage)
{
    $returnArray = [];

    if ($totalPage <= 5) {
        for ($i = 1; $i <= $totalPage; $i++) {
            $returnArray[] = $i;
        }
    } else {
        $lengthLeft = $nowPage - 1;
        $lengthRight = $totalPage - $nowPage;

        if (($lengthLeft < 2) && ($lengthRight < 2)) {
            $returnArray = [];
        } elseif (($lengthLeft < 2) && ($lengthRight > 2)) {
            for ($i = 1; $i <= 5; $i++) {
                $returnArray[] = $i;
            }
        } elseif (($lengthLeft > 2) && ($lengthRight < 2)) {
            $start = $totalPage - 4;
            for ($i = $start; $i <= $totalPage; $i++) {
                $returnArray[] = $i;
            }
        } else {
            for ($i = $nowPage - 2; $i <= $nowPage + 2; $i++) {
                $returnArray[] = $i;
            }
        }
    }

    return $returnArray;
}

/**
 * 将搜索的数组拼接成为url
 * 注意：PHP的内置函数http_build_query，会自动将没有值的参数清除，导致blade模板报错
 * @param $array
 * @return string
 */
public static function arrayToSearchStr($array)
{
    $fields_string = '';

    reset($array);
    end($array);
    $lastKey = key($array);
    reset($array);

    foreach ($array as $key => $value) {
        if ($key != $lastKey) {
            $fields_string .= $key . '=' . $value . '&';
        } else {
            $fields_string .= $key . '=' . $value;
        }
    }
    rtrim($fields_string, '&');

    return $fields_string;
}
}

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