MySQL能力
在开发上的应用基于几个能力体现:
(1)了解:知道用PHP连接数据库;懂得写一些简单的SQL;建一些简单的索引;懂得用工具简单操作一下数据库(增删改库表结构数据等等)。
(2)熟悉:懂得在开发应用上设计数据库,建立一些有效的索引,用explain分析SQL性能,压力测试等等。
(3)很熟悉:深入了解数据库索引、存储引擎原理以及运行机制,能有效地构建高性能可扩展的数据库结构/架构,有效地优化数据库性能配置并加以调试,分析数据库运行状态。
(4)精通:简单地说具备以上所有能力的同时,有多年高负载分布式环境下的优化管理经验。
据观察以及交往经验,70%的PHPer处在了解阶段,25%处于熟悉阶段,>4%很熟悉,精通的人基本就不是PHPer了。
◆70%这个群体最容易忽视MySQL,以为MySQL只是简单的存储媒介,没有优化意识,认为加个内存、CPU就能解决问题。
典型事件:join、order by、group by等语句性能一塌糊涂,数据库根本没有设计(仅限于拆成一个主表,N个附表等),搞不清字段类型及作用,碰到大表的复杂查询就没辙。
◆20%这个群体的人只是MySQL运行机制理解不透彻,对影响MySQL性能的关健因素把握不明确,不熟练。
典型事件:熟读手册,但说不清索引原理,不知道二叉树、HASH等算法对于数据库的作用
◆4%的群体已经基本可以胜任DBA的职能。
OOP能力
(1)了解:了解变量的作用域、类型,及其意义,了解继承机制等,懂得复用、封装概念。
(2)熟悉:熟练应用接口、抽象等技术混合开发程序,并理解其中含义,一般研究过Java。
(3)很熟悉:有过OOP架构设计经验,熟悉设计模式、UML,熟悉PHP对象运行机制,内容管理等。
(4)精通:应该是架构师级别了,不限于PHP。
经常我们会碰到一些自称熟悉OOP却连public、private、protected、static都解释不清的人,是肯定没有经历过正规的OOP项目。
大型网站经验
(1)了解:熟悉PHP开发下的缓存应用(Memcache、APC等);接触过LVS、SQUID应用;有一定的Session处理方案;熟悉负载均衡;熟悉PHP数据连接池应用;了解PHP编程性能优化。
(2)熟悉:掌握分布式缓存及缓存性能优化、熟悉存储系统、文件系统、数据库,开发可扩展平台。能结合负载均衡合理布置流量,对PHP运行性能进行监控与分析。
(3)非常熟悉:具备系统分析师能力,已经超出PHPer环节;
(4)精通。
DOM开发能力

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

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi


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