Paging is basically used by every project, so encapsulate it into a tool class and call it directly in the future. (Although the TP framework is very powerful, it is not a bad idea to seal one yourself.) , which saves time and effort and earns 'work points'.

The paging tool class I sealed is relatively complete. It has the homepage, previous page, next page, last page and an optional number of page numbers (that is, when there are many pages, only the parameters passed in are displayed. (the number of entries), you can also choose whether to use the drop-down page jump function according to your needs.

<?php
/**
 * 分頁工具類
 */
 
class page{
 
  /**
   * 返回分頁所需字符串
   * @param $pageNum int 顯示的頁碼
   * @param $pageCount int 總的頁碼數(shù) 
   * @param $url string 當(dāng)前頁碼路徑
   * @param $Count string 頁碼列表里顯示的個(gè)數(shù)
   * @param $selected bool 是否開啟下拉框選擇功能。默認(rèn)不開啟
   * return $strpage string 分頁字符串
   */
  function showPage($pageNum,$pageCount,$url,$Count = 5,$selected = false){
    $pageMaxVal = $Count - 1;// 頁碼到達(dá)最大時(shí)，頁碼列表里第一個(gè)頁碼與最大頁碼的差
    $pageMiddleVal = ceil($Count / 2);// 依據(jù)需要顯示頁碼個(gè)數(shù)得到的中間值
    $pageMiddleCha = floor($Count / 2);// 依據(jù)需要顯示頁碼個(gè)數(shù)得到的當(dāng)前頁碼與第一個(gè)頁碼的差
 
    // 判斷url是否已經(jīng)存在?
    if(!strpos($url, &#39;?&#39;)){ // 未存在?
      $url .= &#39;?&#39;;
    }else{
      $url .= &#39;&&#39;;
    }
 
    // 首頁
    $strpage = "<a href=&#39;{$url}num=1&#39;>首頁</a>";
 
    // 上一頁
    $preNum = $pageNum > 1 ? $pageNum - 1 : 1;
 
    // 當(dāng)頁碼為第一頁時(shí)取消上一頁按鈕的功能
    $strpage .= $pageNum == 1 ? "<a class=&#39;unshow&#39;>上一頁</a>" : "<a href=&#39;{$url}num={$preNum}&#39;>上一頁</a>";
 
    // 顯示的頁碼列表中的第一個(gè)頁碼
    $startPage = $pageNum > $pageMiddleVal ? $pageNum - $pageMiddleCha : 1;
    // 起始頁碼最大值 = 總頁數(shù) - 4
    if($pageCount - $pageMaxVal > 0 && $startPage > $pageCount - $pageMaxVal){
      $startPage = $pageCount - $pageMaxVal;
    }
 
    // 顯示的頁碼列表中的最后一個(gè)頁碼
    $endPage = $startPage<($pageCount - $pageMaxVal) ? $startPage + $pageMaxVal : $pageCount;
 
    // 中間數(shù)字頁碼
    for($i=$startPage;$i<=$endPage;$i++){
      if($i == $pageNum){
        $strpage .= "<span>$i</span>";
      }else{
        $strpage .= "<a href=&#39;{$url}num=$i&#39;>$i</a>";
      }
    }
 
    // 下一頁
    $nextNum = $pageNum < $pageCount ? $pageNum + 1 : $pageCount;
 
    // 當(dāng)頁碼為最后一頁時(shí)取消下一頁按鈕的功能
    $strpage .= $pageNum == $pageCount ? "<a class=&#39;unshow&#39;>下一頁</a>" : "<a href=&#39;{$url}num={$nextNum}&#39;>下一頁</a>";
 
    // 末頁
    $strpage .= "<a href=&#39;{$url}num={$pageCount}&#39;>末頁</a>";
 
    // 總頁數(shù)
    $strpage .= "總頁數(shù)：{$pageCount}  ";
 
    // 判斷是否是否選擇頁碼功能
    if($selected){ // 選擇了
      $strpage .= "當(dāng)前頁碼：<select onchange=\"location.href=&#39;{$url}num=&#39; + this.value \">";
        for($i = 1; $i <= $pageCount;$i++){
          if($i == $pageNum){
            $strpage .= "<option value=&#39;$i&#39; selected=&#39;selected&#39;>$i</option>";
          }else{
            $strpage .= "<option value=&#39;$i&#39;>$i</option>";
          }
        }
         
      $strpage .= "</select>";
    }
 
    return $strpage;
  }
 
}

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