PHP魔术常量
- /****
- 燕十八 公益PHP讲堂
- 论 坛: http://www.zixue.it
- 微 博: http://weibo.com/Yshiba
- YY频道: 88354001
- ****/
- /***
- ====笔记部分====
- 魔术常量
- 1:无法手动修改他的值,所以叫常量
- 2:但是值又是随环境变动的,所以叫魔术
- ---魔术常量
- __FILE__ 返回当前文件的路径.
- 在框架开发或者是网站初始化脚本中,用来计算网站的根目录
- __LINE__ 返回当前的行号
- 在框架中,可以用来在debug时,记录错误信息
- __CLASS__ 返回当前的类名
- __METHOD__ 返回当前的方法名
- ***/
-
echo '当前正在运行的是',__FILE__,'文件','
'; -
echo '当前在',__DIR__,'目录下
'; -
echo 'hi,我在',__LINE__,'行
'; -
echo 'hello,我在',__LINE__,'行
'; -
echo 'hehe,我在',__LINE__,'行
'; - class Human {
- public static function t() {
-
echo '你正在运行',__CLASS__,'类
'; - echo '下的',__METHOD__,'方法';
- }
- }
- Human::t();

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


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