测试您的 PHP 水平的题目

　　在UnixReview上看到这个很有意思的测试，和大家共享。
May2007
TestYourKnowledgeofPHP
byEmmettDulaney

From:

Increasingly,PHPseemstobethetool/languagethatisusedtomakeWebsitesdynamic.Whileitisfarfromtheonlyopensourcescriptinglanguageavailable,PHPsabilitiesandfeaturesarequicklymakingitnotonlyamust-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.ab
D.ab

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{2,3,4}5

26.Whatfunctioncanbeusedtoseeifafileexists?

A.file()
B.file_there()
C.exist_file()
D.file_exists()

27.Tocreateacookie,yourcodeusesthefollowingentry:SetCookie(user,EmmettDulaney,time()+1800);WhichofthefollowingisthebesttousetoseethevalueEmmettDulaney?

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,bydefault,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.


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,maintainsexitingcontent,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,bydefault,isconfiguredinthePHPconfigurationfiletobesavedbeneath/tmp.Answer:C.

36.$_ENVcontainsvariablesprovidedtoascriptbymeansoftheserverenvironment.Answer:D.

37.Theunlink()functioncanbeusedtodeleteafile.Answer:C.

38.Theunsetfunctioncanbeusedtodestroyavariable.Answer:D.

39.Theamodeofthefopen()functionopensafileforwritingandplacesthefilepointerattheendofthefile.Answer:B.

40.TheHTTP_USER_AGENTHTTPvariablecontainsthebrowsertype,andbrowserversion,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.