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include ("connect.rec"); $qh=mysql_query("SELECT COUNT(*) AS rcnt FROM guestbook"); $data=mysql_fetch_array($qh); $nr=$data["rcnt"]; //判断偏移量参数是否传递给了脚本,如果没有就使用默认值0 if (empty($offset)) { $offset=0; } //查询结果(这里是每页20条,但你自己完全可以改变它) //$result=mysql_query("SELECT * from guestbook ORDER BY time desc LIMIT $offset, 5"); $result=mysql_query("SELECT * from guestbook LIMIT $offset, 5"); //显示返回的5条记录 while ($data=mysql_fetch_array($result)) { printf("姓名:%s ",$data["name"]); printf("EMAIL:%s ",$data["mail"]); printf("个人主页:%s ",$data["url"]); printf("来自:%s ",$data["ip"]); printf("留言时间:%s ",$data["time"]); printf("主题:%s ",$data["title"]); printf("内容:%s ",$data["ly"]); printf(" "); } //下一步,要写出到其它页面的链接 if($offset) //如果偏移量是0,不显示前一页的链接 { $preoffset=$offset-5; print "前一页 n"; } //计算总共需要的页数 $pages=ceil($nr/5); //$pages变量现在包含所需的页数 for ($i=1; $i { $newoffset=5*$i-5; print "$i n"; } //检查是否是最后一页 $next = $offset+5; if ($next{ print "下一页 n"; } printf("返回") ?> |
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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