在UnixReview上看到这个很有意思的测试，和大家共享。
UnixReview.com
May2007
TestYourKnowledgeofPHP
byEmmettDulaney From:http://www.unixreview.com/documents/s=10130/ur0705d/ Increasingly,PHPseemstobethetool/languagethatisusedtomakeWebsitesdynamic.Whileitisfarfromtheonlyopensourcescriptinglanguageavailable,PHP'sabilitiesandfeaturesarequicklymakingitnotonlyamust-haveintheWebworldbutalsoatopiconmanycertificationexams.FollowingarefiftyquestionsonPHPattheknowledgelevelfoundonbeginning/intermediatecertificationexams.Goodluck(answersareattheendofthearticle)! 1.WhatistheclosingtagusedbyaPHP-drivenwebpage? A./>
B.#>
C.?>
D..> 2.WhichPHPconditionaloperatormeansthevaluesareequalANDofthesamedatatype? A.==
B.||
C.===
D.==? 3.WhichofthefollowingstatementsistrueregardingvariablesinPHP(choosetwo)? A.VariablenamesinPHParecasesensitive.
B.VariablenamesinPHParenotcasesensitive.
C.PHPvariablesneedtobedeclaredbeforetheycanbeused.
D.PHPvariablesdonotneedtobedeclaredbeforetheycanbeused. 4.YouareevaluatingascriptwrittenbyaprevIoUsemployee.Thatscriptcontainsarequirestatementthatcausesthescripttoexitwhenanerroroccurs.Youwanttochangethissothescriptwillgenerateawarningwhensuchanerroroccurs,butkeeponrunning.Whatshouldyoureplacerequirewith? A.involve
B.need
C.include
D.call_for 5.WhichofthefollowingdoesnotrepresentacommentinaPHPscript? A.//Thisisacomment
B.<?commentThisisacomment/>
C.#Thisisacomment
D./Thisisacomment/ 6.WhichescapecharacterinPHPrendersalineFeed? A.\n
B.\r
C.\t
D.\ 7.WhatfileisusedtoconfigureglobalPHPsettings?__(Fillintheblank.) 8.Ifthevalueof$AUiscurrently7,whatisitsvalueasaresultofthecommand$AU++; A.8
B.9
C.14
D.49 9.Whichprintftypespecifierisusedforafloatingpointvalue? A.d
B.f
C.s
D.u 10.WhichPHPlogicaloperatorisusedtoseeifbothaandbaretrue? A.a&b
B.a&&b
C.a|b
D.a||b 11.Ifanarrayholds100entries,whichidentifiersignifiesthefirstentry? A.100
B.99
C.1
D.0 12.Whatfunctionmustbecalledtosendtherandomnumbergeneratorbeforearray_rand()? A.limit()
B.scope()
C.srand()
D.hinum() 13.Whichtwochoicesbelowrepresentthedefaultorderresultingfromasortutilizingasort()? A.A-Z
B.Z-A
C.0-9
D.9-0 14.Whichofthefollowingisnottrueforvariablenames? A.Theycancontainanunderscorecharacter
B.Theycanbeginwithanumericcharacter
C.Theycanbeginwithanalphacharacter
D.Theycancontainalphanumericcharacters 15.WhatistheopeningtagusedonaPHP-drivenwebpage? A.<?PHP
B.<PHP
C.</PHP
D.<P 16.Whatareusedtoseparateblocksofstatementswithinacontrolstructure? A.brackets[]
B.parentheses()
C.curlybraces{}
D.quotationmarks"" 17.Whichfunctioncanbeusedtoassignadatatypetoavariable? A.assign
B.assigntype
C.settype
D.type 18.WhichHTTPvariablecontainstheIPaddressofthemachinemakingarequest? A.ADDR_IP
B.ADDR
C.IP_ADDR
D.REMOTE_ADDR 19.Youarecreatingasimpleformforwebuserstosendyouamessage.Whichmethodshouldbeusedwiththatform? A.POST
B.GET
C.SEND
D.READ 20.WithinyourPHPscript,youareperformingadivisionoperationontwovariables.Whatdatatypeisassignedtothedivisionresult,bydefault,ifitisafractionalresult? A.integer
B.double
C.string
D.Boolean 21.Whichmodeofthefopen()functionopensafileforreadingorwriting,maintainsexitingcontent,andplacesthefilepointeratthebeginningofthefile? A.w
B.a
C.r+
D.w+ 22.Whichfunctioncanbeusedtocopyafile? A.copy()
B.clone()
C.rename()
D.repr() 23.Whichofthefollowingisusedtosetacookietoexpire24hoursfromnow? A.$cookie_expire=time()+24
B.$cookie_expire=time()+1440
C.$cookie_expire=time()+86400 24.WhichcharacterisusedasastatementterminatortoindicatetheendofaPHPcommand? A.=
B.#
C.|
D.; 25.Whichofthefollowingcommandswillinitializethe$daysarray? A.$days=()
B.$days=array();
C.$days=""
D.$days=initialize[]
E.12345
F.12,3,45
G.1{2,4}5 26.Whatfunctioncanbeusedtoseeifafileexists? A.file()
B.file_there()
C.exist_file()
D.file_exists() 27.Tocreateacookie,yourcodeusesthefollowingentry:SetCookie("user","EmmettDulaney",time()+1800);Whichofthefollowingisthebesttousetoseethevalue"EmmettDulaney"? A.$user
B.$COOKIE[user]
C.$_COOKIE[user]
D.$COOKIE_user 28.Whichofthefollowingshouldbeusedtocombinetwoormoreexistingarrays? A.array_add()
B.array_merge()
C.array_join()
D.array_combine() 29.Whatfunctionisusedtodeterminewhetherasessionhasbeenstartedforthecurrentuserandthenstartoneifnecessary?__(Fillintheblank.) 30.Afteropeningafilewiththefopen()function,whatisusedtoclosethefilepointer? A.fclose()
B.close()
C.die()
D.end() 31.Whichofthefollowingfunctionscanbeusedtoshowthedatatypeforthe$remainvariable? A.echoshow($remain);
B.echogettype($remain);
C.echotype($remain);
D.echoexplain($remain); 32.Whichofthefollowingfunctionsremovesadirectoryfromafilesystem? A.rmdir()
B.dir()
C.del()
D.dir_gone() 33.Whatisthedifferencebetweensleep()andusleep()? A.sleep()suspendsoperationsandusleep()resumesthem
B.sleep()acceptssecondsandusleep()acceptsmilliseconds
C.sleep()worksforthecurrentprocessandusleep()worksforallprocesses
D.sleep()canonlybespecifiedforthecurrentuserandusleep()canbespecifiedforallusers 34.Youneedtoknowhowmanyelementsareinanarray.Whatfunctionshouldyouusetocountthis? A.list()
B.count()
C.number()
D.sizeof() 35.Informationaboutasession,isconfiguredinthePHPconfigurationfiletobesavedbeneathwhichdirectory? A./var
B./etc
C./tmp
D./usr 36.Whichofthefollowingcontainsvariablesprovidedtoascriptbymeansoftheserverenvironment? A.$_FILES
B.$_POST
C.$_GET
D.$_ENV 37.Whichofthefollowingcanbeusedtodeleteafile? A.delete()
B.rid()
C.unlink()
D.close() 38.Whichofthefollowingfunctionscanbeusedtodestroyavariable? A.erase
B.fi
C.remove
D.unset 39.Whichmodeofthefopen()functionopensafileforwritingandplacesthefilepointerattheendofthefile? A.w
B.a
C.r+
D.w+ 40.WhichHTTPvariablecontainsthebrowsertype,andbrowserversion,amongothervalues? A.BROWSE_AGENT
B.BROWSER_TYPE
C.BROWSER_ENV
D.HTTP_USER_AGENT 41.Ifthecurrentvalueof$bsnsis4400,whatisthenewvalueasaresultofthiscommand:$bsns-=150; A.-150
B.150
C.4250
D.4400
E.4550
F."4400-150" 42.Whatareusedtoencloseconditionalexpressions? A.brackets[]
B.parentheses()
C.curlybraces{}
D.quotationmarks"" 43.WhichPHPdatatypecanbeeitherTRUEorFALSE? A.Truth
B.Integer
C.Boolean
D.Float 44.Whichofthefollowingcontainsvariablesprovidedtoascriptbymeansoffileuploads? A.$_FILES
B.$_POST
C.$_GET
D.$_ENV 45.Whichconstantidentifiesthehighestrandomnumberthatthesystemcangenerate? A.URAND
B.END_NUMBER
C.ULIMIT
D.RAND_MAX 46.PHPprovidessupportforPOSIXthroughfunctionsofwhichclass? A.grep
B.ereg
C.psx
D.efgrp 47.FromaBooleanstandpoint,everyzerovalueinPHPisconsidered: A.True
B.False
C.Error
D.Null 48.Whichfunctionplacesresultsintheoppositeorderofasort()? A.arsort()
B.rev()
C.trosa()
D.zsort() 49.Whichprintftypespecifierisusedforastring? A.d
B.f
C.s
D.u 50.WhichPHPconditionaloperatormeansnotequalto? A.!=
B.=!
C.<=>
D.<> Answers 1.TheclosingtagusedbyPHPis?>.Answer:C. 2.ThePHPconditionaloperatorofthreeequalsigns(===)meansthevaluesareequalandofthesamedatatype.Answer:C. 3.PHPvariablenamesarecasesensitiveandvariablesdonotneedtobedeclaredbeforetheycanbeused.Answer:AandD. 4.Theincludeinstructionwillcreateawarning,butallowthescripttocontinuerunningwhenanerrorisencountered.Answer:C. 5.ThereareatleastthreewaystocreatecommentsinaPHPscript,and<commentisnotoneofthem.Answer:B. 6.The\nescapecharacterinPHPrendersalineFeed.Answer:A. 7.TheglobalconfigurationfileisPHP.ini. 8.Thecommand$AU++;incrementsthevariablebyone–changingitfrom7to8.Answer:A. 9.Theprintftypespecifierfisusedforafloatingpointvalue.Answer:B. 10.ThePHPlogicaloperatortousetoseeifbothaandbaretruewouldbea&&b.Answer:B. 11.Thefirstentryis0,thesecondis1,andthenumbersincrementfromthere.Answer:D. 12.Thesrand()functionmustbecalledtosendtherandomnumbergeneratorbeforearray_rand().Answer:C. 13.Thedefaultorderresultingfromasortutilizingasort()isalphabetic(A-Z)andlowesttohighest(0-9).Answer:AandC. 14.Variablenamescannotbeginwithanumericcharacter.Answer:B. 15.TheopeningtagusedbyPHPis<?PHP.Answer:A. 16.Curlybracesareusedtoseparateblocksofstatementswithinacontrolstructure.Answer:C. 17.Thesettypefunctioncanbeusedtoassignadatatypetoavariable.Answer:C. 18.TheREMOTE_ADDRHTTPvariablecontainstheIPaddressofthemachinemakingarequest.Answer:D. 19.ThePOSTmethodshouldbeusedforaformasdescribed.Answer:A. 20.Iftheresultisnotawholenumber,itisassignedthedoubledatatypeIfitisawholenumber,integerisassigned.Answer:B. 21.Ther+modeofthefopen()functionopensafileforreadingorwriting,andplacesthefilepointeratthebeginningofthefile.Answer:C. 22.Thecopy()functioncanbeusedtocopyafile.Answer:A. 23.Tosetacookietoexpire24hoursfromnow,computethenumberofsecondsandusethetime()function:$cookie_expire=time()+86400.Answer:C. 24.Thesemicoloncharacter(;)isusedasastatementterminatortoindicatetheendofaPHPcommand.Answer:D. 25.Thecommand$days=array();willinitializethe$daysarray.Answer:B. 26.Thefile_exists()functioncanbeusedtoseeifafilebythegivennameisalreadyinexistence.Answer:D. 27.Thevalueof$_COOKIE[user]isequaltowhatwassetinthecookie.Answer:C. 28.Thearray_merge()functionshouldbeusedtocombinetwoormoreexistingarrays.Answer:B. 29.Thefunctiontouseissession_start() 30.Afteropeningafilewiththefopen()function,fclose()isusedtoclosethefilepointer.Answer:A. 31.Thegettypefunctioncanbeusedtoshowthedatatypeforavariable.Answer:B. 32.Thermdir()functionremovesadirectoryfromafilesystem.Answer:A. 33.sleep()acceptssecondsandusleep()acceptsmilliseconds.Answer:B. 34.Thesizeof()functioncantellhowmanyelementsareinanarrayAnswer:D. 35.Informationaboutasession,isconfiguredinthePHPconfigurationfiletobesavedbeneath/tmp.Answer:C. 36.$_ENVcontainsvariablesprovidedtoascriptbymeansoftheserverenvironment.Answer:D. 37.Theunlink()functioncanbeusedtodeleteafile.Answer:C. 38.Theunsetfunctioncanbeusedtodestroyavariable.Answer:D. 39.The"a"modeofthefopen()functionopensafileforwritingandplacesthefilepointerattheendofthefile.Answer:B. 40.TheHTTP_USER_AGENTHTTPvariablecontainsthebrowsertype,amongothervalues.Answer:D. 41.Thisoperationsubtracts150fromtheexistingvalue.Answer:C. 42.Parenthesesareusedtoencloseconditionalexpressions.Answer:B. 43.TheBooleanPHPdatatypecanbeeitherTRUEorFALSE.Answer:C. 44.$_FILEScontainsvariablesprovidedtoascriptbymeansoffileuploads.Answer:A. 45.TheRAND_MAXconstantidentifiesthehighestrandomnumberthatasystemcangenerate.Answer:D. 46.PHPprovidessupportforPOSIXthroughfunctionsoftheeregclass.Answer:B. 47.FromaBooleanstandpoint,everyzerovalueinPHPisconsideredfalse.Answer:B. 48.Thearsort()functionplacesresultsintheoppositeorderofasort().Answer:A. 49.Theprintftypespecifiersisusedforastring.Answer:C. 50.The!=PHPconditionaloperatormeansnotequalto.Answer:A. EmmettDulaneyistheauthoroftheseveralbooksonLinux/UnixandcertificationaswellasacolumnistforUnixReview.com.Emmett'sblogcanbefoundat:http://edulaney.blogspot.com,andhecanbereached(andwelcomesyourcomments)at:edulaney@insightbb.com.