php如何实现分页

php实现分页的方法:1、通过sql查询进行分页;2、使用ajax的方法实现分页;3、通过“function viewpage(p){…}”方式实现分页。推荐:《PHP视频教程》php分页功能的3

php实现分页的方法:1、通过sql查询进行分页;2、使用ajax的方法实现分页;3、通过“function viewpage(p){…}”方式实现分页。

推荐:《PHP视频教程》

php分页功能的3种实现方法

在php项目中,分页是非常常见的,那么php分页功能该如何实现呢?本文将为大家带来的就是php分页功能的3种实现方法,对分页不太熟的同学们有福利了哦!

方法一:将sql查询进行分页进行,需要调用几个函数,具体见下方脚本:

1.pager.class.php

<?php     class pager {    public $sql; //SQL查询语句    public $datanum; //查询所有的数据总记录数    public $page_size; //每页显示记录的条数    protected $_errstr;    protected $_conn;    protected $_query_id;     public function query($query)///这个函数有问题,暂时可以不用    {    $ret = false;    if (!empty($query)) {      if ($this->_conn === false || !is_resource($this->_conn)) {       warningLog(__METHOD__ . ': query sql with no connection', true);      return false;      }    $this->_query_id = @mysql_query($query, $this->_conn);    if ($this->_query_id === false) {    $this->_errstr = @mysql_error();    $ret = false;     } else {    $this->_errstr = 'SUCCESS';    $ret = $this->_query_id;      }    }     $msg = ($ret === false) ? 'false' : strval($ret);     debugLog(__METHOD__.": [$msg] returned for sql query [$query]");    return $ret;    }function __construct($sql,$page_size) {      $result = mysql_query($sql);      $datanum = mysql_num_rows($result);      $this->sql=$sql;      $this->datanum=$datanum;      $this->page_size=$page_size;    }     //当前页数    public function page_id() {      if($_SERVER['QUERY_STRING'] == ""){        return 1;      }elseif(substr_count($_SERVER['QUERY_STRING'],"page_id=") == 0){        return 1;      }else{        return intval(substr($_SERVER['QUERY_STRING'],8));      }    }     //剩余url值    public function url() {      if($_SERVER['QUERY_STRING'] == ""){        return "";      }elseif(substr_count($_SERVER['QUERY_STRING'],"page_id=") == 0){        return "&".$_SERVER['QUERY_STRING'];      }else{        return str_replace("page_id=".$this->page_id(),"",$_SERVER['QUERY_STRING']);      }    }     //总页数    public function page_num() {      if($this->datanum == 0){        return 1;      }else{        return ceil($this->datanum/$this->page_size);      }    }//数据库查询的偏移量    public function start() {      return ($this->page_id()-1)*$this->page_size;    }     //数据输出    public function sqlquery() {      return $this->sql." limit ".$this->start().",".$this->page_size;    }     //获取当前文件名    private function php_self() {      return $_SERVER['PHP_SELF'];    }     //上一页    private function pre_page() {      if ($this->page_id() == 1) { //页数等于1        return "<a href=".$this->php_self()."?page_id=1".$this->url().">上一页</a> ";      }elseif ($this->page_id() != 1) { //页数不等于1        return "<a href=".$this->php_self()."?page_id=".($this->page_id()-1).$this->url().">上一页</a> ";      }    }     //显示分页    private function display_page() {      $display_page = "";      if($this->page_num() <= 10){ //小于10页        for ($i=1;$i<=$this->page_num();$i++) //循环显示出页面          $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> ";          return $display_page;      }elseif($this->page_num() > 10){ //大于10页        if($this->page_id() <= 6){          for ($i=1;$i<=10;$i++) //循环显示出页面            $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> ";            return $display_page;        }elseif(($this->page_id() > 6) && ($this->page_num()-$this->page_id() >= 4)){          for ($i=$this->page_id()-5;$i<=$this->page_id()+4;$i++) //循环显示出页面            $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> "; return $display_page;        }elseif(($this->page_id() > 6) && ($this->page_num()-$this->page_id() < 4)){          for ($i=$this->page_num()-9;$i<=$this->page_num();$i++) //循环显示出页面            $display_page .= "<a href=".$this->php_self()."?page_id=".$i.$this->url().">".$i."</a> ";            return $display_page;        }      }    }     //下一页    private function next_page() {      if ($this->page_id() < $this->page_num()) { //页数小于总页数        return "<a href=".$this->php_self()."?page_id=".($this->page_id()+1).$this->url().">下一页</a> ";      }elseif ($this->page_id() == $this->page_num()) { //页数等于总页数        return "<a href=".$this->php_self()."?page_id=".$this->page_num().$this->url().">下一页</a> ";      }    }     // 设置分页信息    public function set_page_info() {      $page_info = "共".$this->datanum."条 ";      $page_info .= "<a href=".$this->php_self()."?page_id=1".$this->url().">首页</a> ";      $page_info .= $this->pre_page();      $page_info .= $this->display_page();      $page_info .= $this->next_page();      $page_info .= "<a href=".$this->php_self()."?page_id=".$this->page_num().$this->url().">尾页</a> ";      $page_info .= "第".$this->page_id()."/".$this->page_num()."页";      return $page_info;    }   }?>

2.脚本2:

<?php  //类的用法  // 读取分页类  include("pager.class.php");  // 数据库连接初始化//  $db = new mysql();  $impeach_host = '10.81.43.139';  $impeach_usr = 'vmtest15';  $impeach_passwd = 'vmtest15';  $impeach_name = 'ufeature';  $impeach_con = mysql_connect($impeach_host, $impeach_usr, $impeach_passwd) or    die("Can't connect ".mysql_error());  mysql_select_db($impeach_name, $impeach_con);  // 这是一个sql查询语句,并得到查询结果  $sql = "select word from ufeature.spam_accuse_word_list where flag='0'";  // 分页初始化  $page = new pager($sql,20);  // 20是每页显示的数量  // $res_1 = mysql_query($sql) or  //    die("Can't get result ".mysql_error());    $result=mysql_query($page->sqlquery());while($info = mysql_fetch_array($result,MYSQL_ASSOC)){   // while($info = mysql_fetch_array($res_1, MYSQL_ASSOC)){  echo $info["word"]."<br/>";  }  // 页码索引条  echo $page->set_page_info();  ?>

方法二:使用ajax的方法

1、首先了解SQL语句中的limit用法

SELECT * FROM table …… limit 开始位置 , 操作条数 (其中开始位置是从0开始的)

例子

取前20条记录:

SELECT * FROM table …… limit   0 , 20

从第11条开始取20条记录:

SELECT * FROM table …… limit   10 , 20

LIMIT n 和 LIMIT 0,n的意思是一样的。

 如select * from table LIMIT 5; //返回前5行,和 select * from table LIMIT 0,5一样

2、分页原理

所谓分页显示,也就是将数据库中的结果集,一段一段显示出来。

怎么分段,当前在第几段 (每页有几条,当前再第几页)

前10条记录:select * from table limit 0,10

第11至20条记录:select * from table limit 10,20

第21至30条记录:select * from table limit 20,30

分页公式:

(当前页数 – 1 )X 每页条数 , 每页条数

Select * from table limit ($Page- 1) * $PageSize, $PageSize

3、$_SERVER["REQUEST_URI"]函数

预定义服务器变量的一种,所有$_SERVER开头的都叫做预定于服务器变量。

REQUEST_URI的作用是取得当前URI,也就除域名外后面的完整的地址路径。

例子:

当前页为:http://www.test.com/home.php?id=23&cid=22

 echo $_SERVER["REQUEST_URI"]

结果为:/home.php?id=23&cid=22

4、parse_url()解析URL函数

parse_url() 是讲URL解析成有固定键值的数组的函数

例子

$ua=parse_url("http://username:password@hostname/path?arg=value#anchor");print_r($ua);

结果:

Array( [scheme] => http  ;协议 [host] => hostname  ;主机域名 [user] => username  ;用户 [pass] => password  ;密码 [path] => /path   ;路径 [query] => arg=value  ;取参数 [fragment] => anchor  ;)

5、代码实例

这个一个留言的分页,分为3个部分,一个是数据库设计,一个是连接页面,一个是显示页面。

(1)设计数据库

设计数据库名为bbs,有一个数据表为message,里面包含title,lastdate,user,content等字段,分别表示留言标题,留言日前,留言人,留言的内容

(2)连接页面

<?php$conn = @ mysql_connect("localhost", "root", "123456") or die("数据库链接错误");mysql_select_db("bbs", $conn);mysql_query("set names 'GBK'"); //使用GBK中文编码;//将空格,换行转换为HTML可解析function htmtocode($content) { $content = str_replace("\\\\\\\\n", "<br>", str_replace(" ", " ", $content)); //两个str_replace嵌套 return $content;}//$content=str_replace("'","‘",$content); //htmlspecialchars();  ?>

(3)显示页面

<?php include("conn.php");$pagesize=2; //设置每页显示2个记录$url=$_SERVER["REQUEST_URI"]; $url=parse_url($url);$url=$url[path]; $numq=mysql_query("SELECT * FROM `message`");$num = mysql_num_rows($numq);if($_GET){$pageval=$_GET;$page=($pageval-1)*$pagesize;$page.=',';}if($num > $pagesize){ if($pageval<=1)$pageval=1; echo "共 $num 条". " <a href=$url?page=".($pageval-1).">上一页</a> <a href=$url?page=".($pageval+1).">下一页</a>";}$SQL="SELECT * FROM `message` limit $page $pagesize "; $query=mysql_query($SQL);   while($row=mysql_fetch_array($query)){?><table width=500 border="0" cellpadding="5" cellspacing="1" bgcolor="#add3ef"> <tr bgcolor="#eff3ff"> <td>标题:<?php echo $row[title]?></td> <td>时间:<?php echo $row[lastdate]?></td> </tr> <tr bgcolor="#eff3ff"> <td> 用户:<?php echo $row[user]?></td><td></td> </tr> <tr> <td>内容:<?php echo htmtocode($row[content]);?></td> </tr> <br></table><?php }?>

方法3:

<script> function viewpage(p){ if(window.XMLHttpRequest){ var xmlReq = new XMLHttpRequest(); } else if(window.ActiveXObject) { var xmlReq = new ActiveXObject('Microsoft.XMLHTTP'); } var formData = "page="+p; xmlReq.onreadystatechange = function(){ if(xmlReq.readyState == 4){ document.getElementByIdx_x('content2').innerHTML = xmlReq.responseText; } } xmlReq.open("post", "hotel_list.php", true); xmlReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xmlReq.send(formData); return false; } </script>

脚本2:

header("Content-Type:text/html;charset=GB2312"); $pagesize=10; //echo $_POST['page']; $result = mysql_query("Select count(DISTINCT hotelname) FROM ".TBL_HOTELS); $myrow = mysql_fetch_array($result); $numrows=$myrow[0];  $pages=intval($numrows/$pagesize); if ($numrows%$pagesize) $pages++; if (isset($_POST['page'])){ $page=intval($_POST['page']); } else{ //设置为第一页 $page=1; } $first=1; $prev=$page-1; $next=$page+1; $last=$pages; //计算记录偏移量 $offset=$pagesize*($page - 1); //读取指定记录数 $result=mysql_query("select `hotelname` , count( * ) from ".TBL_HOTELS." GROUP BY `hotelname` order by id desc limit $offset,$pagesize"); $num = mysql_num_rows($result); while ($row = mysql_fetch_array($result,MYSQL_NUM)) { $hotelname[] = $row[0]; $countpeople[] = $row[1]; } for($a=0;$a<$num;$a++) { //$result=mysql_query("select count(title) from " . TBL_Comments ." where `title`=\\\\\\\\"".$title[$a]."\\\\\\\\""); //$row = mysql_fetch_row($result); echo "<TABLE style=\\\\\\\\"MARGIN-BOTTOM: 20px\\\\\\\\" cellSpacing=0 cellPadding=0 width=100% border=0>\\\\\\\\n"; echo "<TBODY>\\\\\\\\n"; echo "<TR>\\\\\\\\n"; echo "<TD style=\\\\\\\\"PADDING-TOP: 5px\\\\\\\\" vAlign=top align=left width=80>\\\\\\\\n"; //rating_bar($title[$a],5); echo "</TD>\\\\\\\\n"; echo "<TD style=\\\\\\\\"PADDING-TOP: 5px\\\\\\\\" align=left width=100%><A title=$hotelname[$a] style=\\\\\\\\"FONT-SIZE: 14px\\\\\\\\" href=#>$hotelname[$a]</A>\\\\\\\\n"; echo "</TD></TR>\\\\\\\\n"; echo " <TR>\\\\\\\\n"; echo "<TD></TD>\\\\\\\\n"; echo "<TD style=\\\\\\\\"PADDING-LEFT: 0px\\\\\\\\">\\\\\\\\n"; echo "<IMG src=\\\\\\\\"images/comment.gif\\\\\\\\" border=0> 推荐人数:($countpeople[$a]) |\\\\\\\\n"; echo "<SPAN>平均分:<STRONG></STRONG> (".$count."票) | 评论数:()</SPAN>\\\\\\\\n"; echo "</TD></TR></TBODY></TABLE>\\\\\\\\n"; } echo "<TABLE style=\\\\\\\\"MARGIN-TOP: 30px\\\\\\\\" cellSpacing=0 cellPadding=0 width=\\\\\\\\"100%\\\\\\\\""; echo "border=0>"; echo "<TBODY><TR><TD colSpan=3 height=20>"; echo "<DIV align=center>"; echo "<P align=left><FONT color=red>第".$page."页/总".$pages."页 | 总".$numrows."条</FONT> | "; if ($page>1) echo "<a onclick=\\\\\\\\"viewpage(".$first.")\\\\\\\\" href='#'>首页</a> | "; if ($page>1) echo "<a onclick=\\\\\\\\"viewpage(".$prev.")\\\\\\\\" href='#'>上页</a> | "; if ($page<$pages) echo "<a onclick=\\\\\\\\"viewpage(".$next.")\\\\\\\\" href='#'>下页</a> | "; if ($page<$pages) echo "<a onclick=\\\\\\\\"viewpage(".$last.")\\\\\\\\" href='#'>尾页</a>"; echo "转到第 <INPUT maxLength=3 size=3 value=1 name=goto_page> 页 <INPUT hideFocus onclick=\\\\\\\\"viewpage(document.all.goto_page.value)\\\\\\\\" type=button value=Go name=cmd_goto>"; echo "</P></DIV></TD></TR></TBODY></TABLE>";

关于作者: 营销实力派

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