PHP原生分页函数实现

function showPage($keyword,$page,$totalPage,$sep=" "){
    $url = $_SERVER ['PHP_SELF'];           //获取当前路径
    $index = ($page == 1) ? "首页 " : " <a href='{$url}?page=1&keyword={$keyword}'>首页</a>";
    $last = ($page == $totalPage) ? "尾页" : "<a href='{$url}?page={$totalPage}&keyword={$keyword}'>尾页</a>";

    $prevPage=($page>=1)?$page-1:1;
    $nextPage=($page>=$totalPage)?$totalPage:$page+1;

    $prev = ($page == 1) ? "上一页" : "<a href='{$url}?page={$prevPage}&keyword={$keyword}'>上一页</a>";
    $next = ($page == $totalPage) ? "下一页" : "<a href='{$url}?page={$nextPage}&keyword={$keyword}'>下一页</a>";
    $str = "总共 {$totalPage} 页 当前是第 <span style='color:red;'>{$page} </span>页";

    $p="";
    for($i = 1; $i <= $totalPage; $i ++) {
        //当前页无连接
        if ($page == $i) {
            $p .= " <span style='color:red;'>{$i}</span>  ";
        } else {
            $p .= "<a href='{$url}?page={$i}&keyword={$keyword}'>  {$i}  </a>";
        }
    }

    $pageStr=$str.$sep .  $index  . $sep . $prev.$sep . $p.$sep . $next.$sep . $last;
    return $pageStr;    //返回分页字符串
}