这个变量是怎么来的-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

这个变量是怎么来的

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 23, 2016 pm 01:44 PM

下面这段代码中 if(isset($_GET['n_page'])){ //判断当前页码
的 n_page是从哪来的，我查了一下不是数据表中的字段，它到底是怎么来的，难道是随便定义的一个玩意吗

<?phpsession_start();include_once("conn/conn.php");?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><link href="css/viewmeeting.css" type="text/css" rel="stylesheet" /><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title></head><body><h3 id="会议信息浏览">会议信息浏览</h3><?php$sqlview="select * from tb_meeting_info";$num=2;                                                 //每页显示最大记录数  if(isset($_GET['n_page'])){	                        //判断当前页码   $c_page = $_GET['n_page'];					            //将$n_page赋给变量$c_apge  }else{		$c_page = 1;								    //初始化变量$c_page	    } $l_rst = $conn -> PageExecute($sqlview,$num,$c_page);	//执行pageExecute函数$rst_view = $conn->execute($sqlview);$record=count($rst_view->GetRows());                    //获取总记录数if($record==0){echo "<span class=\"norecord\">当前没有任何记录</span>";}else{?><table width="728" border="0" cellspacing="0" cellpadding="0" bordercolor="#66CC00">  <tr class="tableheader">    <td width="55" align="center" height="25">会议编号</td>    <td width="60" align="center">会议名称</td>    <td width="60" align="center">部门名称</td>    <td width="80" align="center">会议地点</td>    <td width="80" align="center">会议日期</td>    <td width="45" align="center">主持人</td>    <td width="60" align="center">出席人员</td>    <td width="45" align="center">记录人</td>    <td width="120" align="center">会议摘要</td>	<td width="60" align="center">查看详情</td>  </tr><?phpwhile(!$l_rst->EOF){?>  <tr>    <td height="30"><?php echo $l_rst->fields[0]; ?></td>    <td height="30"><?php echo $l_rst->fields[1]; ?></td>    <td height="30"><?php echo $l_rst->fields[2]; ?></td>    <td height="30"><?php echo $l_rst->fields[3]; ?></td>    <td height="30"><?php echo $l_rst->fields[4]; ?></td>    <td height="30"><?php echo $l_rst->fields[5]; ?></td>    <td height="30"><?php echo $l_rst->fields[6]; ?></td>    <td height="30"><?php echo $l_rst->fields[7]; ?></td>    <td height="30"><?php echo $l_rst->fields[8]; ?></td>	<td height="30" align="center"><a href="#" onclick="javascript:Wopen=open('showinfo.php?id=<?php echo $l_rst->fields[0]; ?>','','height=720,width=1004,scrollbars=no');"><img src="/static/imghwm/default1.png"  data-src="images/xiazai.gif"  class="lazy"      style="max-width:90%"  style="max-width:90%" border="0" alt="详情"></a></td>  </tr><?php   $l_rst->movenext();   } ?></table><div class="sepa_page"><table>  <tr>    <td>  <font color='#999999'>当前是第<?php echo $l_rst -> absolutePage(); ?>页/一共<?php echo $l_rst -> LastPageNo(); ?>页</font><?php		if(!$l_rst -> AtfirstPage()){					//如果当前页不是首页?><!--  输出向上翻页超链接  -->		<a href ="<?php echo "?lmbs=$_GET[lmbs]&n_page=1" ?>"> 首页 </a>		<a href ="<?php echo "?lmbs=$_GET[lmbs]&n_page=".($l_rst -> absolutePage() - 1); ?>"> 上一页 </a><!--  ----------------------------  --><?php		}		if(!$l_rst -> AtlastPage()){					//如果当前页不是尾页?><!--  输出向下翻页超链接  -->		<a href = "<?php echo "?lmbs=$_GET[lmbs]&n_page=".($l_rst -> absolutePage() + 1); ?>"> 下一页 </a>		<a href ="<?php echo "?lmbs=$_GET[lmbs]&n_page=".($l_rst -> LastPageNo());?>"> 尾页 </a>	<!--  -----------------------------  --><?php		}?><?php}?>      </td>	  <td width="100" align="right"><span style="color:#FF0000">点此导出报表>>></span></td>	  <td width="60">		   <a href="createform.php"><img  src="/static/imghwm/default1.png"  data-src="images/out_15.jpg"  class="lazy"  align="bottom"    style="max-width:90%"  style="max-width:90%" border="0" / alt="这个变量是怎么来的" ></a>		</td>	 </tr>  </table></div></body></html>

回复讨论(解决方案)

看看session里的值，还有是哪个页面传进来的，看一下

这个应该是分页页码参数，类似这样的
http://index.php?n_page=2,3,4......
当n_page为第一页的时候，通常是获取不到参数的，所以需要判断一下$_GET['n_page']是否存在，不存在则为第一页。如果存在，则根据获取到的值，显示对应页的内容。

你不是有这样的语句吗？
"> 首页
$_GET['n_page'] 就是这样来的

通过页面链接传的值呀？
$_GET取值；没取到的清楚下，默认为第一页
你后面的分页里面都有呀

其实是由"> 首页来的
这涉及到url传值的知识，当一个链接传到地址栏的时候$_GET[ ]数组就会截取它，因为$_GET[ ]数组是全局变量数组，专门负责截获地址栏中的值的。
只可惜大家都没有答对，上面是我悟出来的。

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

11 Best PHP URL Shortener Scripts (Free and Premium)Mar 03, 2025 am 10:49 AM

Long URLs, often cluttered with keywords and tracking parameters, can deter visitors. A URL shortening script offers a solution, creating concise links ideal for social media and other platforms. These scripts are valuable for individual websites a

Working with Flash Session Data in LaravelMar 12, 2025 pm 05:08 PM

Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

Simplified HTTP Response Mocking in Laravel TestsMar 12, 2025 pm 05:09 PM

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

Build a React App With a Laravel Back End: Part 2, ReactMar 04, 2025 am 09:33 AM

This is the second and final part of the series on building a React application with a Laravel back-end. In the first part of the series, we created a RESTful API using Laravel for a basic product-listing application. In this tutorial, we will be dev

cURL in PHP: How to Use the PHP cURL Extension in REST APIsMar 14, 2025 am 11:42 AM

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

12 Best PHP Chat Scripts on CodeCanyonMar 13, 2025 pm 12:08 PM

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Announcement of 2025 PHP Situation SurveyMar 03, 2025 pm 04:20 PM

The 2025 PHP Landscape Survey investigates current PHP development trends. It explores framework usage, deployment methods, and challenges, aiming to provide insights for developers and businesses. The survey anticipates growth in modern PHP versio

Notifications in LaravelMar 04, 2025 am 09:22 AM

In this article, we're going to explore the notification system in the Laravel web framework. The notification system in Laravel allows you to send notifications to users over different channels. Today, we'll discuss how you can send notifications ov

See all articles