php MYSQL制作分页

代码

	<?php
	
	header("Content-type:text/html;charset=utf-8");
	//传入页码
	$p = $_GET["p"];
	//每页数量
	$pageSize = 1;
	//链接数据库
	$host = "localhost";
	$user = "root";
	$pass = "";
	$db = "test";
	$conn = mysqli_connect($host, $user, $pass);
	if (!$conn) {
	    echo "失败";
	    exit;
	}
	mysqli_select_db($conn, $db);
	//分页查询mysql语句
	$sql = "SELECT * FROM user LIMIT " . ($p - 1) * $pageSize . ",$pageSize";
	//总记录数mysql语句
	$count = "SELECT count(*) FROM user";
	$total_result = mysqli_fetch_row(mysqli_query($conn, $count));
	//总记录数
	$total = $total_result["0"];
	//数据集
	$result = mysqli_query($conn, $sql);
	echo "<table border='1' cellspacing='0'>";
	//循环打印数据
	while ($row = mysqli_fetch_assoc($result)) {
	    echo "<tr><td>{$row['id']}</td><td>{$row['name']}</td></tr>";
	}
	echo "</table>";
	mysqli_free_result($result);
	mysqli_close($conn);
	/*显示数据+分页条*/
	//计算最后一页
	$total_page = ceil($total / $pageSize);
	$pageStyle = "";
	//如果大于1 就显示首页 上一页
	if ($p > 1) {
	    $pageStyle .= "<a href='" . $_SERVER['PHP_SELF'] . "?p=1'>首页</a>";
	    $pageStyle .= "<a href='" . $_SERVER['PHP_SELF'] . "?p=" . ($p - 1) . "'>上一页</a>";
	}
	/*每次显示5个页码的逻辑*/
	//初始化
	$showPage = 5;
	//计算偏移量
	$pageoffset = ($showPage - 1) / 2;
	
	$start = 1;
	$end = $total_page;
	//总页数大于显示的页数
	if ($total_page > $showPage) {
	    //当前页大于偏移量+1 显示省略号
	    if ($p > $pageoffset + 1) {
	        $pageStyle .= "<a>...</a>";
	    }
	    //当前页大于偏移量 显示开始位置 和结束位置
	    if ($p > $pageoffset) {
	        //当前页减去 偏移量 显示开始位置
	        $start = $p - $pageoffset;
	        //如果最后一页大于当前页加上偏移量 就显示当前页+偏移量的页面 否则就是显示最后一页
	        $end = $total_page > $p + $pageoffset ? $p + $pageoffset : $total_page;
	    } else {
	        //当前页小于偏移量
	        //起始位置
	        $start = 1;
	        //结束位置
	        $end = $total_page > $showPage ? $showPage : $total_page;
	    }
	    //当前页+偏移量大于最后一页
	    if ($p + $pageoffset > $total_page) {
	        $start = $start - ($p + $pageoffset - $end);
	        $end = $total_page;
	    }
	}
	//循环显示分页
	for ($i = $start; $i <= $end; $i++) {
	    if($i == $p){
	        $pageStyle .= "<a style='color:red;font-size:20px' href='" . $_SERVER['PHP_SELF'] . "?p=" . $i . "'>{$i}</a>";
	    }else{
	        $pageStyle .= "<a href='" . $_SERVER['PHP_SELF'] . "?p=" . $i . "'>{$i}</a>";
	    }
	}
	//如果总页数大于显示的页数 并且 最后一页大于当前页+偏移量
	if ($total_page > $showPage && $total_page > $p + $pageoffset) {
	    $pageStyle .= "<a>...</a>";
	}
	
	//如果不等于最后一页 就显尾页 下一页
	if ($p != $total_page) {
	    $pageStyle .= "<a href='" . $_SERVER['PHP_SELF'] . "?p=" . ($p + 1) . "'>下一页</a>";
	    $pageStyle .= "<a href='" . $_SERVER['PHP_SELF'] . "?p=" . $total_page . "'>尾页</a>";
	}
	
	$pageStyle .= "<span>共有{$total}条数据</span>";
	//显示分页
	echo $pageStyle;