/*
* Created on 2007-6-8
* Programmer : Alan , Msn - haowubai@hotmail.com
* PHP100.com Develop a project PHP - MySQL - Apache
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
//为了避免重复包含文件而造成错误,加了判断函数是否存在的条件:
if(!function_exists(pageft)){
//定义函数pageft(),三个参数的含义为:
//$totle:信息总数;
//$displaypg:每页显示信息数,这里设置为默认是20;
//$url:分页导航中的链接,除了加入不同的查询信息“page”外的部分都与这个URL相同。
// 默认值本该设为本页URL(即$_SERVER["REQUEST_URI"]),但设置默认值的右边只能为常量,所以该默认值设为空字符串,在函数内部再设置为本页URL。
function pageft($totle,$displaypg=20,$url=''){
//定义几个全局变量:
//$page:当前页码;
//$firstcount:(数据库)查询的起始项;
//$pagenav:页面导航条代码,函数内部并没有将它输出;
//$_SERVER:读取本页URL“$_SERVER["REQUEST_URI"]”所必须。
global $page,$firstcount,$pagenav,$_SERVER;
//为使函数外部可以访问这里的“$displaypg”,将它也设为全局变量。注意一个变量重新定义为全局变量后,原值被覆盖,所以这里给它重新赋值。
$GLOBALS["displaypg"]=$displaypg;
if(!$page) $page=1;
//如果$url使用默认,即空值,则赋值为本页URL:
if(!$url){ $url=$_SERVER["REQUEST_URI"];}
//URL分析:
$parse_url=parse_url($url);
$url_query=$parse_url["query"]; //单独取出URL的查询字串
if($url_query){
//因为URL中可能包含了页码信息,我们要把它去掉,以便加入新的页码信息。
//这里用到了正则表达式,请参考“PHP中的正规表达式”
$url_query=ereg_replace("(^|&)page=$page","",$url_query);
//将处理后的URL的查询字串替换原来的URL的查询字串:
$url=str_replace($parse_url["query"],$url_query,$url);
//在URL后加page查询信息,但待赋值:
if($url_query) $url.="&page"; else $url.="page";
}else {
$url.="?page";
}
//页码计算:
$lastpg=ceil($totle/$displaypg); //最后页,也是总页数
$page=min($lastpg,$page);
$prepg=$page-1; //上一页
$nextpg=($page==$lastpg ? 0 : $page+1); //下一页
$firstcount=($page-1)*$displaypg;
//开始分页导航条代码:
$pagenav="显示第 ".($totle?($firstcount+1):0)."-".min($firstcount+$displaypg,$totle)." 条记录,共 $totle 条记录";
//如果只有一页则跳出函数:
if($lastpg
$pagenav.=" 首页 ";
if($prepg) $pagenav.=" 前页 "; else $pagenav.=" 前页 ";
if($nextpg) $pagenav.=" 后页 "; else $pagenav.=" 后页 ";
$pagenav.=" 尾页 ";
//下拉跳转列表,循环列出所有页码:
$pagenav.=" 到第 页,共 $lastpg 页";
}
}
?>
/*
//(前面程序略)
include("pageft.php"); //包含“pageft.php”文件
//取得总信息数
$result=mysql_query("select * from mytable");
$total=mysql_num_rows($result);
//调用pageft(),每页显示10条信息(使用默认的20时,可以省略此参数),使用本页URL(默认,所以省略掉)。
pageft($total,10);
//现在产生的全局变量就派上用场了:
$result=mysql_query("select * from mytable limit $firstcount,$displaypg ");
while($row=mysql_fetch_array($result)){
//(列表内容略)
}
//输出分页导航条代码:
echo $pagenav;
//(后面程序略)
*/
?>

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SublimeText3 Chinese version
Chinese version, very easy to use

Notepad++7.3.1
Easy-to-use and free code editor