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  • What is semantic HTML, and why is it important?
    What is semantic HTML, and why is it important?
    Using semantic HTML is important because it improves accessibility, supports SEO and simplifies development and maintenance. First, semantic tags such as, and provide context for assistive technologies, allowing screen readers to recognize navigation blocks and interactive elements; second, search engines rely on HTML structure to understand content, and the correct title hierarchy helps content organization and indexing; finally, clear semantic tags such as, and make team collaboration more efficient, new developers can understand layouts faster, reduce dependence on class names, and thus speed up development progress.
    HTML Tutorial . Web Front-end 735 2025-06-24 00:56:12
  • What is the method attribute, and how do I use it to specify the HTTP method (GET or POST) used to submit the form?
    What is the method attribute, and how do I use it to specify the HTTP method (GET or POST) used to submit the form?
    ThemethodattributeinHTMLformsdetermineshowdataissenttotheserver,usingeitherGETorPOST.GETappendsdatatotheURL,haslengthlimits,andissuitablefornon-sensitiverequestslikesearches.POSTsendsdatainthebody,offersbettersecurity,andisidealforsensitiveorlargedat
    HTML Tutorial . Web Front-end 951 2025-06-24 00:55:52
  • What are void return types in PHP 7.1?
    What are void return types in PHP 7.1?
    VoidreturntypesinPHP7.1ensureafunctionmustnotreturnanyvalue,improvingcodeclarityandpreventingmisuse.1.Declaringafunctionwithvoidmeansitshouldnotreturnanythingmeaningful.2.Itcaneitherreturnnothingoruseanemptyreturntoexitearly.3.Returninganyvalue,inclu
    PHP Tutorial . Backend Development 794 2025-06-24 00:55:30
  • How do I use the element to represent a section of navigation links?
    How do I use the element to represent a section of navigation links?
    The key to using elements to represent navigation link areas is semantics and clear structure, usually in conjunction with organizational links. 1. The basic structure is to put the parallel links in and wrap them inside, which is friendly to auxiliary tools and is conducive to style control and SEO; 2. Commonly used in or, for placing main navigation or footer link collections; 3. A page can contain multiple areas, such as main menu, sidebar or footer independent navigation.
    HTML Tutorial . Web Front-end 755 2025-06-24 00:55:12
  • How do I execute SQL queries using PHP?
    How do I execute SQL queries using PHP?
    Yes,youcanrunSQLqueriesusingPHP,andtheprocessinvolveschoosingadatabaseextension,connectingtothedatabase,executingqueriessafely,andclosingconnectionswhendone.Todothis,firstchoosebetweenMySQLiorPDO,withPDObeingmoreflexibleduetosupportingmultipledatabas
    PHP Tutorial . Backend Development 1030 2025-06-24 00:54:51
  • How has HTML evolved over time, and what are the key milestones in its history?
    How has HTML evolved over time, and what are the key milestones in its history?
    HTMLhasevolvedsignificantlysinceitscreationtomeetthegrowingdemandsofwebdevelopersandusers.Initiallyasimplemarkuplanguageforsharingdocuments,ithasundergonemajorupdates,includingHTML2.0,whichintroducedforms;HTML3.x,whichaddedvisualenhancementsandlayout
    HTML Tutorial . Web Front-end 443 2025-06-24 00:54:31
  • How do I prevent cross-site scripting (XSS) attacks in PHP?
    How do I prevent cross-site scripting (XSS) attacks in PHP?
    TopreventXSSattacksinPHP,sanitizeinputandescapeoutputbasedoncontext.1.SanitizeuserinputusingPHP’sfilter_var()functionorHTMLPurifierforHTMLcontent.2.Escapeoutputwithhtmlspecialchars()forHTML,json_encode()forJavaScript,andrawurlencode()forURLs.3.SetHTT
    PHP Tutorial . Backend Development 536 2025-06-24 00:54:10
  • What is PHP-FIG and what are its standards?
    What is PHP-FIG and what are its standards?
    PHP-FIGmattersbecauseitcreatedsharedstandardsforPHPframeworks.BeforePHP-FIG,frameworksuseddifferentmethodsfortaskslikeautoloadingandHTTPhandling,makingcodereusedifficult.ThegroupintroducedPSRslike1.PSR-1(codingstylebasics),2.PSR-4(autoloadingstandard
    PHP Tutorial . Backend Development 1001 2025-06-24 00:53:51
  • How do I minimize the size of HTML files?
    How do I minimize the size of HTML files?
    To reduce the size of HTML files, you need to clean up redundant code, compress content, and optimize structure. 1. Delete unused tags, comments and extra blanks to reduce volume; 2. Move inline CSS and JavaScript to external files and merge multiple scripts or style blocks; 3. Simplify label syntax without affecting parsing, such as omitting optional closed tags or using short attributes; 4. After cleaning, enable server-side compression technologies such as Gzip or Brotli to further reduce the transmission volume. These steps can significantly improve page loading performance without sacrificing functionality.
    HTML Tutorial . Web Front-end 257 2025-06-24 00:53:32
  • What are the best practices for writing clean and maintainable PHP code?
    What are the best practices for writing clean and maintainable PHP code?
    The key to writing clean and easy-to-maintain PHP code lies in clear naming, following standards, reasonable structure, making good use of comments and testability. 1. Use clear variables, functions and class names, such as $userData and calculateTotalPrice(); 2. Follow the PSR-12 standard unified code style; 3. Split the code structure according to responsibilities, and organize it using MVC or Laravel-style catalogs; 4. Avoid noodles-style code and split the logic into small functions with a single responsibility; 5. Add comments at key points and write interface documents to clarify parameters, return values ??and exceptions; 6. Improve testability, adopt dependency injection, reduce global state and static methods. These practices improve code quality, collaboration efficiency and post-maintenance ease.
    PHP Tutorial . Backend Development 214 2025-06-24 00:53:11
  • How do I use the error_reporting() function to control the level of error reporting?
    How do I use the error_reporting() function to control the level of error reporting?
    In PHP, you need to use the error_reporting() function to control the error reporting level, and set it with predefined constants and bit operators. 1. Use error_reporting(E_ERROR|E_WARNING|E_NOTICE) to enable the specified type of error report; 2. Use error_reporting(E_ALL) to display all errors; 3. Use error_reporting(0) to turn off the error display in the production environment and set display_errors=0 to ensure safety; 4. You can use error_reporting(E_ALL&~E_NOTICE&~
    PHP Tutorial . Backend Development 782 2025-06-24 00:52:51
  • How do I use content delivery networks (CDNs) to serve static assets?
    How do I use content delivery networks (CDNs) to serve static assets?
    TouseaCDNeffectively,chooseaproviderlikeCloudflareorCloudFrontbasedonpricing,integration,andsupport;uploadstaticassetsusingpushorpullmethods;updatewebsitecodetoreferencetheCDNURLs;andmonitorperformanceforoptimization.First,selectaCDNproviderthatalign
    PHP Tutorial . Backend Development 176 2025-06-24 00:52:30
  • What is the difference between and elements?
    What is the difference between and elements?
    ThemaindifferencebetweenandinHTMLliesintheirdefaultdisplaybehaviorandtypicalusage.1.isablock-levelelementusedforstructuringlargersectionsofawebpage,suchaslayoutblocksorgroupingmultipleelementstogether.2.isaninlineelementusedforstylingormanipulatingsm
    HTML Tutorial . Web Front-end 374 2025-06-24 00:52:11
  • How do I use var_dump() or print_r() to inspect variables during debugging?
    How do I use var_dump() or print_r() to inspect variables during debugging?
    Usevar_dump()fordetailedvariableinspectionandprint_r()forquickreadableoutput.1.var_dump()showstype,size,andnestedelements,idealforAPIsoruncertaindatastructures.2.Wrapvar_dump()intagsforreadabilityanduseitwithmultiplevariables.3.print_r()offerssimplif
    PHP Tutorial . Backend Development 389 2025-06-24 00:51:50

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