分页在后台管理中是经常使用的功能，分页显示方便大量数据的管理。
实例代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>用户列表</title>
</head>
<body>
<?<span>php
</span><span>$con</span> = <span>mysql_connect</span>("localhost","root",""<span>);
</span><span>mysql_query</span>("set names utf8"<span>);
</span><span>mysql_select_db</span>("zhiye",<span>$con</span><span>);
</span><span>$pageSize</span> = 1; <span>//</span><span>每页显示的数量</span>
<span>$rowCount</span> = 0; <span>//</span><span>要从数据库中获取</span>
<span>$pageNow</span> = 1; <span>//</span><span>当前显示第几页
//如果有pageNow就使用，没有就默认第一页。</span>
<span>if</span> (!<span>empty</span>(<span>$_GET</span>['pageNow'<span>])){
</span><span>$pageNow</span> = <span>$_GET</span>['pageNow'<span>];
}
</span><span>$pageCount</span> = 0; <span>//</span><span>表示共有多少页</span>
<span>$sql1</span> = "select count(id) from user"<span>;
</span><span>$res1</span> = <span>mysql_query</span>(<span>$sql1</span><span>);
</span><span>if</span>(<span>$row1</span>=<span>mysql_fetch_row</span>(<span>$res1</span><span>)){
</span><span>$rowCount</span> = <span>$row1</span>[0<span>];
}
</span><span>//</span><span>计算共有多少页，ceil取进1</span>
<span>$pageCount</span> = <span>ceil</span>((<span>$rowCount</span>/<span>$pageSize</span><span>));
</span><span>//</span><span>使用sql语句时，注意有些变量应取出赋值。</span>
<span>$pre</span> = (<span>$pageNow</span>-1)*<span>$pageSize</span><span>;
</span><span>$sql2</span> = "select * from user limit <span>$pre</span>,<span>$pageSize</span>"<span>;
</span><span>$res2</span> = <span>mysql_query</span>(<span>$sql2</span><span>);</span>
<span>while</span>(<span>$row</span>=<span>mysql_fetch_assoc</span>(<span>$res2</span><span>)){
</span><span>echo</span> <span>$row</span>['user_name']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['name']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['email']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['password']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['tel']."<br>"<span>;
}
</span><span>for</span> (<span>$i</span>=1;<span>$i</span><=<span>$pageCount</span>;<span>$i</span>++<span>){
</span><span>echo</span> "<a href='userList.php?pageNow=<span>$i</span>'><span>$i</span></a> "<span>;
}
</span>?>
</body>
</html>当有大量数据时，就不能使用上述方法。
<?<span>php
</span><span>$con</span> = <span>mysql_connect</span>("localhost","root",""<span>);
</span><span>mysql_query</span>("set names utf8"<span>);
</span><span>mysql_select_db</span>("zhiye",<span>$con</span><span>);
</span><span>$pageSize</span> = 1; <span>//</span><span>每页显示的数量</span>
<span>$rowCount</span> = 0; <span>//</span><span>要从数据库中获取</span>
<span>$pageNow</span> = 1; <span>//</span><span>当前显示第几页
//如果有pageNow就使用，没有就默认第一页。</span>
<span>if</span> (!<span>empty</span>(<span>$_GET</span>['pageNow'<span>])){
</span><span>$pageNow</span> = <span>$_GET</span>['pageNow'<span>];
}
</span><span>$pageCount</span> = 0; <span>//</span><span>表示共有多少页</span>
<span>$sql1</span> = "select count(id) from user"<span>;
</span><span>$res1</span> = <span>mysql_query</span>(<span>$sql1</span><span>);
</span><span>if</span>(<span>$row1</span>=<span>mysql_fetch_row</span>(<span>$res1</span><span>)){
</span><span>$rowCount</span> = <span>$row1</span>[0<span>];
}
</span><span>//</span><span>计算共有多少页，ceil取进1</span>
<span>$pageCount</span> = <span>ceil</span>((<span>$rowCount</span>/<span>$pageSize</span><span>));
</span><span>//</span><span>使用sql语句时，注意有些变量应取出赋值。</span>
<span>$pre</span> = (<span>$pageNow</span>-1)*<span>$pageSize</span><span>;
</span><span>$sql2</span> = "select * from user limit <span>$pre</span>,<span>$pageSize</span>"<span>;
</span><span>$res2</span> = <span>mysql_query</span>(<span>$sql2</span><span>);
</span><span>//</span><span>$sql = "select * from user";
//$res = mysql_query($sql,$con);</span>
<span>while</span>(<span>$row</span>=<span>mysql_fetch_assoc</span>(<span>$res2</span><span>)){
</span><span>echo</span> <span>$row</span>['user_name']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['name']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['email']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['password']."<br>"<span>;
</span><span>echo</span> <span>$row</span>['tel']."<br>"<span>;
}
</span><strong><span>if</span>(<span>$pageNow</span>>1<span>){
</span><span>$prePage</span> = <span>$pageNow</span>-1<span>;
</span><span>echo</span> "<a href='userList.php?pageNow=<span>$prePage</span>'>pre</a> "<span>;
}
</span><span>if</span>(<span>$pageNow</span><<span>$pageCount</span><span>){
</span><span>$nextPage</span> = <span>$pageNow</span>+1<span>;
</span><span>echo</span> "<a href='userList.php?pageNow=<span>$nextPage</span>'>next</a> "<span>;
</span><span>echo</span> "当前页{<span>$pageNow</span>}/共{<span>$pageCount</span>}页"<span>;
}
</span><span>echo</span> "<br/><br/>"<span>;
</span>?>
<form action="userList.php">
<input type="text" name="pageNow">
<input type="submit" value="GO">
</form></strong>
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