PHP面試題附答案

時(shí)間：2023-04-05 10:18:10 筆試題目我要投稿

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PHP面試題附答案

　　1. Which of the following will not add john to the users array?

PHP面試題附答案

　　1. $users[] = ‘john’;

　　2. array_add($users,’john’);

　　3. array_push($users,’john’);

　　4. $users ||= ‘john’;

　　Answer: 2,4

　　2. What’s the difference between sort(), asort() and ksort(),rsort()? Under what circumstances would you use each of these?

　　sort(): 本函數(shù)對(duì)數(shù)組的值進(jìn)行排序。當(dāng)本函數(shù)結(jié)束時(shí)數(shù)組單元將被從最低到最高重新安排,array 中的單元賦予新的鍵名。這將刪除原有的鍵名而不僅是重新排序。

　　asort(): 這個(gè)函數(shù)將數(shù)組的值重新排序，由小至大排列。數(shù)組的索引亦跟著值的順序而變動(dòng)。當(dāng)您在程序中需要重新整理數(shù)組值的順序時(shí)，就可以使用這個(gè)函數(shù)。

　　ksort(): 對(duì)數(shù)組按照鍵名排序，保留鍵名到數(shù)據(jù)的關(guān)聯(lián)。本函數(shù)主要用于關(guān)聯(lián)數(shù)組。

　　rsort(): 本函數(shù)對(duì)數(shù)組進(jìn)行逆向排序(最高到最低)。與sort()執(zhí)行相反的操作。

　　3. What would the following code print to the browser? Why?

　　$num = 10;

　　function multiply(){

　　$num = $num * 10;

　　}

　　multiply();

　　echo $num;

　　4. What is the difference between a reference and a regular variable? How do you pass by reference & why would you want to?

　　pass by reference like this functions(&$vars);

　　it likes more fast;

　　5. What functions can you use to add library code to the currently running script?

　　inlcude() or require();

　　6. What is the difference between foo() & @foo()?

　　if foo() throw a error, will be alert, but @foo() no;

　　7. How do you debug a PHP application?

　　xdebug or use die() do it;

　　8. What does === do? What’s an example of something that will give true for ‘==’, but not ‘===’?

　　=== 用于精確比較 ex: (” == null) => true but ( ”===null) =>false;

　　9. How would you declare a class named “myclass” with no methods or properties?

　　class myclass{

　　}

　　10. How would you create an object, which is an instance of “myclass”?

　　$myoject = new myclass();

　　11. How do you access and set properties of a class from within the class?

　　getVar() or setVar() ;

　　12. What is the difference between include & include_once? include & require?

　　require:PHP 程式在執(zhí)行前，就會(huì)先讀入 require 所指定引入的檔案，使它變成 PHP 程式網(wǎng)頁(yè)的一部份。常用的函式，亦可以這個(gè)方法將它引入網(wǎng)頁(yè)中。錯(cuò)誤產(chǎn)生致命錯(cuò)誤。

　　include:這個(gè)函式一般是放在流程控制的處理區(qū)段中。PHP 程式網(wǎng)頁(yè)在讀到 include 的檔案時(shí)，才將它讀進(jìn)來(lái)。這種方式，可以把程式執(zhí)行時(shí)的流程簡(jiǎn)單化。錯(cuò)誤產(chǎn)生警報(bào)。

　　include_once:此行為和include()語(yǔ)句類(lèi)似，唯一區(qū)別是如果該文件中的代碼已經(jīng)被包含了，則不會(huì)再次包含。如同此語(yǔ)句名字暗示的那樣，只會(huì)包含一次。

　　13. What function would you use to redirect the browser to a new page?

　　1. redir()

　　2. header()

　　3. location()

　　4. redirect()

　　14. What function can you use to open a file for reading and writing?

　　1. fget();

　　2. file_open();

　　3. fopen();

　　4. open_file();

　　15. What’s the difference between mysql_fetch_row() and mysql_fetch_array()?