<title> 文本标签 </title> <!-- 在网页中,为了强调某一部分文字或者为了让文字有所变化 --> <!-- 有利于搜索引擎的搜索 --> <!-- <hn> <b> <i> <u> <sub> <sup> <font> <tt> <cite> <em> <strong> <small> <big> --> <!-- 标题都会自动换行的 --> <h1 id="使用-h-就会输出-号标题"> 使用<h1>,就会输出1号标题 </h1> <h2 id="使用-h-就会输出-号标题"> 使用<h2>,就会输出2号标题 </h2> <h3 id="使用-h-就会输出-号标题"> 使用<h3>,就会输出3号标题 </h3> <h4 id="使用-h-就会输出-号标题"> 使用<h4>,就会输出4号标题 </h4> <h5 id="使用-h-就会输出-号标题"> 使用<h5>,就会输出5号标题 </h5> <h6 id="使用-h-就会输出-号标题"> 使用<h6>,就会输出6号标题 </h6> <h7> 使用<h7>,没有此标签 </h7> <br> <b> 粗体 </b> <br> <u> 下划线 </u> <br> <i> 斜体 </i> <br> <!-- 多个标签嵌套,要一一对应 --> <b><u><i> 我的样式是这样的!! ^*^ !!! </i></u></b> <br> <font face="黑体" color="red" size="6"> 绝对字体大小为6的红色黑体字 </font> <br> <font face="宋体" color="green" size="+3"> 相对字体大小为+3 的绿色宋体字 </font> <br> <tt> <tt> 输出打印机文字</tt><br> <cite> <cite> 输出引证、举例的斜体字</cite><br> <em> <em> 输出强调的斜体字</em><br> <strong> <strong> 输出强调的粗体字</strong><br> <small> <small> 输出小型字体</small><br> <big> <big> 输出大型的文字</big><br> </big></small></strong></em></cite></tt></h7> </h6> </h5> </h4> </h3> </h2> </h1>
The above introduces the learning PHP process record (3) - Commonly used tags 2, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.

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

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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