1、PHP面試題附答案1.Whichofthefollowingwillnotaddjohntotheusersarray?1.$users=john2.array_add($users,john);3.array_push($users,john);4.$users|=johnAnswer:2,42.Whatsthedifferencebetweensort(),asort()andksort(),rsort()?Underwhatcircumstanceswouldyouuseeachofthese?sort():本函數對數組的值進行排序。當本函數結束時數組單元將被從最低到最高從新布置,arr

2、ay中的單元賦予新的鍵名。這將刪除原有的鍵名而不僅是從新排序。asort():這個函數將數組的值從新排序，由小至大排列。數組的索引亦跟著值的順序而變動。當您在程序中需要從新整理數組值的順序時，就能夠使用這個函數。ksort():對數組根據鍵名排序，保留鍵名到數據的關聯。本函數重要用于關聯數組。rsort():本函數對數組進行逆向排序(最高到最低)。與sort()履行相反的操作。3.Whatwouldthefollowingcodeprinttothebrowser?Why?$num=10;functionmultiply()$num=$num*10;multiply();echo$num;10

3、4.Whatisthedifferencebetweenareferenceandaregularvariable?Howdoyoupassbyreferencewhywouldyouwantto?passbyreferencelikethisfunctions($vars);itlikesmorefast;5.Whatfunctionscanyouusetoaddlibrarycodetothecurrentlyrunningscript?inlcude()orrequire();6.Whatisthedifferencebetweenfoo()foo()?iffoo()throwaerro

4、r,willbealert,butfoo()no;7.HowdoyoudebugaPHPapplication?xdebugorusedie()doit;8.Whatdoes=do?Whatsanexleofsomethingthatwillgivetruefor=,butnot=?=用于精到準確比較ex:(=null)=truebut(=null)=false;9.Howwouldyoudeclareaclassnamedmyclasswithnomethodsorproperties?classmyclass10.Howwouldyoucreateanobject,whichisanins

5、tanceofmyclass?$myoject=newmyclass();11.Howdoyouaccessandsetpropertiesofaclassfromwithintheclass?getVar()orsetVar();12.Whatisthedifferencebetweenincludeinclude_once?includerequire?require:PHP程式在履行前，就會先讀入require所指定引入的檔案，使它變成PHP程式網頁的一部份。常用的函式，亦能夠這個方法將它引入網頁中。毛病產生致命毛病。include:這個函式一般是放在流程控制的處理區段中。PHP程式網頁

6、在讀到include的檔案時，才將它讀進來。這種方式，能夠把程式履行時的流程簡單化。毛病產生警報。include_once:此行為和include()語句類似，唯一區別是假如該文件中的代碼已經被包括了，則不會再次包括。好像此語句名字暗示的那樣，只會包括一次。13.Whatfunctionwouldyouusetoredirectthebrowsertoanewpage?1.redir()2.header()3.location()4.redirect()214.Whatfunctioncanyouusetoopenafileforreadingandwriting?1.fget();2.fil

7、e_open();3.fopen();4.open_file();315.Whatsthedifferencebetweenmysql_fetch_row()andmysql_fetch_array()?mysql_fetch_row():返回根據所獲得的行生成的數組，假如沒有更多行則返回FALSE。mysql_fetch_array():是mysq_fetch_row()的擴展版本。除了將數據以數字索引方式儲存在數組中之外，還能夠將數據作為關聯索引儲存，用字段名作為鍵名。16.Whatdoesthefollowingcodedo?Explainwhatsgoingonthere.$date=

8、08/26/2003printereg_replace(0-9+)/(0-9+)/(0-9+),2/1/3,$date);本函數以正則的規則來解析比對字符串，欲取而代之的字符串為2/1/3。返回值為字符串類型，為取代后的字符串結果。17.Givenalineoftext$string,howwouldyouwritearegularexpressiontostripalltheHTMLtagsfromit?strip_tags18.WhatsthedifferencebetweenthewayPHPandPerldistinguishbetweenarraysandhashes?19.HowcanyougetroundthestatelessnatureofHTTPusingPHP?20.Whatdoesthe