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Project1MemberManagementSystemSchoolofSoftware,ChengduPolytechnicLecturer:MuQichunTask8UserLoginProductionofLoginFront-endFormRightclickthememberdirectory,andcreateanewfile:login.php.Thestaticcontentsontheloginpageandtheregistrationpagearesimilartoeachothertoacertainextent.So,wecancopythecontentsinthesingup.phpfiledirectlyandmakemodifications.Firstmodifythecurrentcolumnsinthenavigationbar.Leavetheusernameandpasswordintheform,andleavethevalidationcontentsofusernameandpasswordinthejavaScriptfunctioncheck.Next,rightclickthememberdirectory,andcreateanewfilepostLogin.php.Modifytheactionattributeintheformtag,andmakeitintopostLogin.php.Next,producetheback-endfile.SpecificCodesofLoginWehavewellknownthefourstepsofoperatingadatabasewithPHPwhenweproducemembersignuppreviously.Infact,thesestepsarerequiredaslongasyouusePHPtooperateadatabase.ThecontentsinStep1andStep2areallthesameforeveryoperation,andneedtoberepeatedlywritteninmanyfiles.Forconvenience,wecanputthesecontentsinaseparatefileandcitetheminotherfiles.Inthisway,wecanbothsimplifythecodeanddirectlymodifyaparticularcontentwhenweneedtomodifysomeofthecontents(e.g.,modifyingthedatabaseusernameandpassword),whichcanbeautomaticallymodifiedinthewholeprogram.Rightclickthememberdirectory,andcreateanewPHPfileconn.php.AndthenbacktothepostReg.phpfile,andclipthecodeinStep1andStep2toconn.php:SpecificCodesofLoginBacktopostReg.phpagain,andaddthefollowingcodeatthelocationwhereyoujustclippedthecode:Theroleofthefunctionincludeistoinclude(import)thefilecontentassignedintheparameter.Werecommendthefunctioninclude_once,whichcanensurethatyouonlyimportthecontentonceinthesamepageandavoidrepeatedimportinmisoperation.Inadditiontothefunctioninclude,theincludedfileinPHPcanalsousethefunctionrequire.Theyhavethesamebasicrolebutdifferentprocessingmodesforerrors.Whenitrunsintoanullincludedfileoranerror,andthenreportanerror,thestatementrequire()willstoptheexecutiveprogram,andtheinclude()willignoretheerror,andproceedwiththeexecution.Thereisalsoarequire_oncemethod,whichcanensurethatyouonlyimportthecontentonceinthesamepage.Similarly,theconn.phpfileisfirstlyincludedinpostLogin.php.Inthisway,itmeansthatStep1andStep2indatabaseoperationhavebeendone.SpecificCodesofLoginOurnexttaskistoreadthefront-endformdataanddonecessaryvalidation.AndthenweuseSQLQuerytoquerywhethertheassignedusernameandpasswordexistinthedatatable.Iftheyexist,theloginsucceeded;otherwise,loginfailed.ConclusionThislectureintroduceshowtoimplementmemberlogin.Thebasisofjudgingasuccessfuluserloginisthatwhenwequerytheassignedusernameandpass

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