PHP开发工作心得
一、扎实PHP自身的基础知识、函数、常量等,尽量用内置的方法解决问题(因为个人写的往往执行效率没有内置方法高);
二、代码尽量少的实现功能(因为PHP的执行其实是,将咱们的代码先处理成底层语言进行机器执行,如果代码多,转化的内容多自然耗时多);
三、进行优化时可以通过压力测试ab进行测试自己写的代码,并对代码进行优化后,再次压测一下效率;

[email protected];
五、多使用unset()函数,将变量注销释放;
六、少用正则表达式,双刃剑;
七、避免循环for循环条件中做循环;
八、数组的key值,务必使用带引号的字符串做键值,为什么务必这么干?
当$arr = array( "key"=>"hehe" ); $arr["key"] 是正确的、提高效率的
$arr[key] 这样没有引号的,是不好的,因为PHP执行时,发现key没有引号
此时,他会去检查key是否是一个常量,如果开启错误机制报错的话会提示notice
未发现key这个常量。如果加了 引号后,PHP会直接进入$arr数组中寻找为key的键值,
相对效率就高效了
九、影响PHP性能的外部因素有:
此点的 启示是: 当一个网站很慢时,也许不是PHP本身的性能慢了、可能是网络问题、可能是硬件问题等;作为一个架构师排除问题所在就不能停留在程序的优化了!
十、读取内存内容要比读取数据库内容效率要低,所以说大流量提速网站往往用memcache、redis等分布式缓存将数据缓存到内存,然后先和内存进行数据的读取;
十一、通过XHPorf(源自 Facebook测试PHP性能分析 工具);可以测试出访问网站的流程,并且可以通过流程图标红的区域快速找到,耗时方法,进行方法优化即可;
版权声明:本文为博主原创文章,未经博主允许不得转载。

PHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.

TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.

PHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.

PHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita


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

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SublimeText3 Linux new version
SublimeText3 Linux latest version

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SublimeText3 Chinese version
Chinese version, very easy to use

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.
