PHP、MYSQLI實現分頁（初學者）
阿新 • • 發佈：2018-03-19
php mysqli //求出總條數 假如13條
/*需求：每頁只顯示5條 即分三頁
* ceil(總條數/每頁顯示數) ceil是向上取整，就算剩一條也要單獨占一頁
*/
select * from bbs_user limit 0 , 5 這是第一頁 1
select * from bbs_user limit 5 , 5 這是第二頁 2
select * from bbs_user limit 10 , 5 這是第三頁 3
select * from bbs_user limit 15 , 5 這是第四頁 4
推出來的公式
($page - 1) * $sum (5) //$page是當前頁數
/*需求：每頁只顯示5條 即分三頁
* ceil(總條數/每頁顯示數) ceil是向上取整，就算剩一條也要單獨占一頁
*/
select * from bbs_user limit 0 , 5 這是第一頁 1
select * from bbs_user limit 5 , 5 這是第二頁 2
select * from bbs_user limit 10 , 5 這是第三頁 3
select * from bbs_user limit 15 , 5 這是第四頁 4
推出來的公式
($page - 1) * $sum (5) //$page是當前頁數
先寫好了查詢頁面，如下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系統主頁面</title>
</head>
<body>
<?php
$conn = mysqli_connect("localhost","root","");
if(!$conn){
echo "失敗";
}
mysqli_select_db($conn,"bbs");
$sql = "select * from bbs_user";
$obj = mysqli_query($conn,$sql);
echo "<center>";
echo "<table border = 1 cellspacing = '0' cellpadding = '10'>";
echo "<th>編號</th><th>姓名</th><th>密碼</th><th>地址</th><th>性別</th><th>年齡</th><th>操作</th>";
while($row = mysqli_fetch_assoc($obj)){
echo "<tr>";
echo '<td>'.$row['id'].'</td>';
echo '<td>'.$row['username'].'</td>';
echo '<td>'.$row['password'].'</td>';
echo '<td>'.$row['address'].'</td>';
echo '<td>'.$row['sex'].'</td>';
echo '<td>'.$row['age'].'</td>';
echo '<td><a href = "del.php?id='.$row['id'].'">刪除</a>/<a href = "update.php?id='.$row['id'].'">修改</a></td>';
echo "</tr>";
}
echo "</table>";
echo "<a href = 'add.php'>添加</a>";
echo "<center>";
mysqli_close($conn);
?>
</body>
</html>在查詢界面上做了如下改變：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系統主頁面</title>
</head>
<body>
<?php
//5.設置$page的默認值
#$page = 1;
//8.修改$page的值
$page = empty($_GET['page'])?1 : $_GET['page'];
$conn = mysqli_connect("localhost","root","");
if(!$conn){
echo "失敗";
}
mysqli_select_db($conn,"bbs");
//------------分頁開始-------------------
//1.求出總條數
$sql = "select count(*) as count from bbs_user";
$result = mysqli_query($conn,$sql);
$pageRes = mysqli_fetch_assoc($result);
#var_dump($pageRes); //13
$count = $pageRes['count'];
//2.每頁顯示數(5)
$num = 5;
//3.根據每頁顯示數求出總頁數
$pageCount = ceil($count / $num); //向上取整
#var_dump($pageCount); //3
//4.根據總頁數求出偏移量
$offset = ($page - 1) * $num; //$page默認為 1, 下一步設置
//------------分頁結束-------------------
//6.修改sql語句
$sql = "select * from bbs_user limit " . $offset . ',' . $num;
#$sql = "select * from bbs_user";
$obj = mysqli_query($conn,$sql);
echo "<center>";
echo "<table border = 1 cellspacing = '0' cellpadding = '10'>";
echo "<th>編號</th><th>姓名</th><th>密碼</th><th>地址</th><th>性別</th><th>年齡</th><th>操作</th>";
while($row = mysqli_fetch_assoc($obj)){
echo "<tr>";
echo '<td>'.$row['id'].'</td>';
echo '<td>'.$row['username'].'</td>';
echo '<td>'.$row['password'].'</td>';
echo '<td>'.$row['address'].'</td>';
echo '<td>'.$row['sex'].'</td>';
echo '<td>'.$row['age'].'</td>';
echo '<td><a href = "del.php?id='.$row['id'].'">刪除</a>/<a href = "update.php?id='.$row['id'].'">修改</a></td>';
echo "</tr>";
}
echo "</table>";
#echo "<a href = 'add.php'>添加</a>";
echo "<center>";
//10.設置上一頁下一頁的$prev和$next
$prev = $page - 1;
$next = $page + 1;
//11.設置頁數限制
if($prev<1){
$prev = 1;
}
if($next>$pageCount){
$next = $pageCount;
}
//關閉連接
mysqli_close($conn);
?>
<!--7.添加首頁、上一頁、下一頁、尾頁(href沒有鏈接)-->
<!--9.給定鏈接,首頁和尾頁寫死，首頁就是page=1，尾頁是總頁數，上一頁先用$prev表示，下一步設置，下一頁同上一頁-->
<a href="testFenye.php?page=1">首頁</a>
<a href="testFenye.php?page=<?php echo $prev;?>">上一頁</a>
<!--混編簡寫-->
<a href="testFenye.php?page=<?=$next;?>">下一頁</a>
<a href="testFenye.php?page=<?=$pageCount;?>">尾頁</a>
</body>
</html>PHP、MYSQLI實現分頁（初學者）