图片里这个 为什么while循环的开始的花括号那里就写了结束标记呢 后面的那个结束花括号又单独被php标签包含 while执行语句里面是独立的php标签 为什么要这样写呢? 把这些所有的都包含在一个 这样的标签里面不行吗 我经常看到这样的写法的 一点都不懂为什么要这样写 大家能给解释一下吗
回复内容:
图片里这个 为什么while循环的开始的花括号那里就写了结束标记呢 后面的那个结束花括号又单独被php标签包含 while执行语句里面是独立的php标签 为什么要这样写呢? 把这些所有的都包含在一个 这样的标签里面不行吗 我经常看到这样的写法的 一点都不懂为什么要这样写 大家能给解释一下吗
一个是PHP代码,一个是HTML代码。如果把HTML代码写到PHP代码块里面需要用echo
把HTML代码包裹起来。但这样写PHP解释器就会自动处理中间的HTML代码,省事很多,看着也清晰。
php与html混写的一种方式
要么以php文件的开始与结束符分隔
这种方式就是你所遇到的,碰到html的内容,无论是while还是for等等,只要碰到了,就得结束
要么把html作为php中的一个字符串
<code><?php while (condition) { echo "<div>***" } ?></code>
php标签外面的文字会被当成文本处理,因此那个}
就是php的一部分,跟第39行的while
配对。
其实可以有一个更优雅的写法:替代语法。
<code><?php while (xxx): ?> <div>some html code</div> <!-- 只有单一变量也可以按照下一行这么写 --> <div>value $_GET['a'] is =$_GET['a']?></div> <?php endwhile; ?> </code>
对于if
、for
等语句,也有类似的替代语法。
模板的引入就是为了不要在代码里拼接html,那样是歪门邪道。
因为这是php里输出html啊

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

PHPisusedforsendingemailsduetoitsbuilt-inmail()functionandsupportivelibrarieslikePHPMailerandSwiftMailer.1)Usethemail()functionforbasicemails,butithaslimitations.2)EmployPHPMailerforadvancedfeatureslikeHTMLemailsandattachments.3)Improvedeliverability

PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc


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

SublimeText3 English version
Recommended: Win version, supports code prompts!

Zend Studio 13.0.1
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

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.

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