PHP面试题附答案

时间:2024-08-17 10:36:10 资料大全 我要投稿
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PHP面试题附答案

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

PHP面试题附答案

  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(): 本函数对数组的值进行排序,

PHP面试题附答案

。当本函数结束时数组单元将被从最低到最高重新安排,array 中的单元赋予新的键名。这将删除原有的键名而不仅是重新排序。

  asort(): 这个函数将数组的值重新排序,由小至大排列。数组的索引亦跟着值的 顺序而变动。当您在程序中需要重新整理数组值的 顺序时,就可以使用这个函数。

  ksort(): 对数组按照键名排序,保留键名到数据的关联。本函数主要用于关联数组。

  rsort(): 本函数对数组进行逆向排序(最高到最低)。与sort()执行相反的操作。

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

  $num = 10;

  function multiply(){

  $num = $num * 10;

  }

  multiply();

  echo $num;

  10

  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 ‘===’?

  === 用于精确比较 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 程式在执行前,就会先读入 require 所指定引入的档案,使它变成 PHP 程式网页的一部份,

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PHP面试题附答案》(https://www.unjs.com)。常用的函式,亦可以这个方法将它引入网页中。错误产生致命错误。

  include:这个函式一般是放在流程控制的处理区段中。PHP 程式网页在读到 include 的档案时,才将它读进来。这种方式,可以把程式执行时的流程简单化。错误产生警报。

  include_once:此行为和include()语句类似,唯一区别是如果该文件中的代码已经被包含了,则不会再次包含。如同此语句名字暗示的那样,只会包含一次。

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

  1. redir()

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