php 文件上传 简单代码
1、程序文件
<?php //判断临时文件存放路径是否包含用户上传的文件 if(is_uploaded_file($_FILES["uploadfile"]["tmp_name"])){ //为了更高效,将信息存放在变量中 // by http://www.jbxue.com $upfile=$_FILES["uploadfile"];//用一个数组类型的字符串存放上传文件的信息 //print_r($upfile);//如果打印则输出类似这样的信息Array ( [name] => m.jpg [type] => image/jpeg [tmp_name] => C:\WINDOWS\Temp\php1A.tmp [error] => 0 [size] => 44905 ) $name=$upfile["name"];//便于以后转移文件时命名 $type=$upfile["type"];//上传文件的类型 $size=$upfile["size"];//上传文件的大小 $tmp_name=$upfile["tmp_name"];//用户上传文件的临时名称 $error=$upfile["error"];//上传过程中的错误信息 //echo $name; //对文件类型进行判断,判断是否要转移文件,如果符合要求则设置$ok=1即可以转移 switch($type){ case "image/jpg": $ok=1; break; case "image/jpeg": $ok=1; break; case "image/gif" : $ok=1; break; default:$ok=0; break; } //如果文件符合要求并且上传过程中没有错误 if($ok&&$error=='0'){ //调用move_uploaded_file()函数,进行文件转移 move_uploaded_file($tmp_name,'up/'.$name); //操作成功后,提示成功 echo "<script language='\"javascript\"'>alert('succeed')</script>"; }else{ //如果文件不符合类型或者上传过程中有错误,提示失败 echo "<script language='\"javascript\"'>alert('failed')</script>"; } } ?>
如果想实现功能更强的上传程序,比如多文件、多图片上传的功能,可以参考下这篇文章:
http://www.jbxue.com/article/6378.html
2、上传页面
<!--设置提交文件的表单-->

ThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin

You should care about DependencyInjection(DI) because it makes your code clearer and easier to maintain. 1) DI makes it more modular by decoupling classes, 2) improves the convenience of testing and code flexibility, 3) Use DI containers to manage complex dependencies, but pay attention to performance impact and circular dependencies, 4) The best practice is to rely on abstract interfaces to achieve loose coupling.

Yes,optimizingaPHPapplicationispossibleandessential.1)ImplementcachingusingAPCutoreducedatabaseload.2)Optimizedatabaseswithindexing,efficientqueries,andconnectionpooling.3)Enhancecodewithbuilt-infunctions,avoidingglobalvariables,andusingopcodecaching

ThekeystrategiestosignificantlyboostPHPapplicationperformanceare:1)UseopcodecachinglikeOPcachetoreduceexecutiontime,2)Optimizedatabaseinteractionswithpreparedstatementsandproperindexing,3)ConfigurewebserverslikeNginxwithPHP-FPMforbetterperformance,4)

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl


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

Dreamweaver Mac version
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

WebStorm Mac version
Useful JavaScript development tools

Atom editor mac version download
The most popular open source editor

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
