PHP+Mysql development of page number paging
<html>
<head>
<meta http-equiv="CONTENT-TYPE" content="text/html;">
</head>
<body>
<?php
/** 1.傳入頁面 **/
$page = $_GET['p'];
/** 2.根據(jù)頁面取出數(shù)據(jù)：php->mysql **/
$host = "localhost";
$username = 'root';
$password = '123456789';
$db = 'bbs2';
$PageSize=5;
$ShowPage=3;
//連接數(shù)據(jù)庫
$conn = mysql_connect($host, $username, $password);
if(!$conn){
echo "數(shù)據(jù)庫連接失敗";
exit;
}
//選擇所要操作的數(shù)據(jù)庫
mysql_select_db($db);
//設(shè)置數(shù)據(jù)庫編碼格式
mysql_query('SET NAMES UTF8');
//編寫sql獲取分頁數(shù)據(jù)：SELECT * FROM 表名 LIMIT 起始位置 , 顯示條數(shù)
$sql = "SELECT*FROM test LIMIT ".($page-1)*$PageSize .",$PageSize";
if(!$sql){
echo "取出不成功";
};
//把sql語句傳送到數(shù)據(jù)庫
$result = mysql_query($sql);
//處理我們的數(shù)據(jù)
echo "<table border=1 cellspacing=0 width=15% >";
echo "<tr><td>ID</td><td>名字</td><td>性別</td></tr>";
while($row = mysql_fetch_assoc($result)){
echo "<tr>";
echo "<td>{$row['id']}</td>";
echo "<td>{$row['name']}</td>";
echo "<td>{$row['sex']}</td>";
echo "<tr>";
}
echo "</table>";
//釋放結(jié)果
mysql_free_result($result);
//獲取數(shù)據(jù)總數(shù)
$to_sql="SELECT COUNT(*)FROM test";
$to_result=mysql_fetch_array(mysql_query($to_sql));
$to=$to_result[0];
//計算頁數(shù)
$to_pages=ceil($to/$PageSize);
mysql_close($conn);
/** 3.顯示數(shù)據(jù)+分頁條 **/
$page_banner="";
//計算偏移量
$pageffset=($ShowPage-1)/2;
if($page>1){
$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=1'>首頁</a>";
$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($page-1)."'>上一頁</a>";
}
//初始化數(shù)據(jù)
$start=1;
$end=$to_pages;
if ($to_pages>$ShowPage){
if($page>$pageffset+1){
$page_banner.="...";
}
if ($page>$pageffset){
$start=$page-$pageffset;
$end=$to_pages>$page+$pageffset?$page+$pageffset:$to_pages;
}else{
$start=1;
$end=$to_pages>$ShowPage?$ShowPage:$to_pages;
}
if ($page+$pageffset>$to_pages){
$start=$start-($page+$pageffset-$end);
}
}
for($i=$start;$i<=$end;$i++){
$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($i)."'>{$i}</a>";
}
//尾部省略
if ($to_pages>$ShowPage&&$to_pages>$page+$pageffset){
$page_banner.="...";
}
if ($page<$to_pages){
$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($page+1)."'>下一頁</a>";
$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($to_pages)."'>尾頁</a>";
}
$page_banner.="共{$to_pages}頁";
echo $page_banner;
?>
</body>
</html>When there is too much data, the page number will also be too long. At this time, it is necessary to hide the page number to achieve a beautiful effect
Code explanation
$start=1;
$end=$to_pages;
if ($to_pages>$ShowPage){
if($page>$pageffset+1){
$page_banner.="...";
}The total number of pages is greater than the displayed number of pages, and the current page is greater than the offset + 1 display...Omitted if ($page>$pageffset){
$start=$page-$pageffset;
$end=$to_pages>$page+$pageffset?$page+$pageffset:$to_pages;$start starting position if the current page is greater than the offset Shift, then the starting position displays the current page minus the offset $end position. If the total number of pages is greater than the current page plus the offset, then the end position is the current page plus the offset. If not If it is greater, the last one will be displayed else{
$start=1;
$end=$to_pages>$ShowPage?$ShowPage:$to_pages;
}If the current page is less than the offset, the starting position is 1 if ($page+$pageffset>$to_pages){
$start=$start-($page+$pageffset-$end); If the page number plus offset is greater than the last page, the starting position is equal to the original starting position minus the current page plus offset minus Go to the end position. }
for($i=$start;$i<=$end;$i++){
$page_banner.="<a href='".$_SERVER['PHP_SELF']."?p=".($i)."'>{$i}</a>";
}Display page number//尾部省略
if ($to_pages>$ShowPage&&$to_pages>$page+$pageffset){
$page_banner.="...";
}When the total number of pages is greater than the displayed number of pages and the last page is greater than the current page plus the offset, it is omitted
