php实现分页功能的3种方法 |
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直接上代码，希望大家仔细阅读 。 方法一：讲sql查询进行分页进行，需要调用几个函数，具体见脚本：
<?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, $impeach_passwd) or
die("Cant connect ".mysql_error());
mysql_select_db($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("Cant 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 $page->set_page_info();
?>
方法二：使用ajax的方法 SELECT * FROM table …… limit 开始位置 ， 操作条数 （其中开始位置是从0开始的） 例子 Select * from table limit ($Page- 1) * $PageSize, $PageSize 3、$_SERVER["REQUEST_URI"]函数
$ua=parse_url("http://username:password@hostname/path?arg=value#anchor");
print_r($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
<?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
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