Interview Questions A collection of PHP interview questions compiled by Color Color

PHP basic knowledge part
1. Find the value of $a

Copy the code The code is as follows:

$a = "hello";
$b = &$a;
unset($b);
$ b = "world";
echo $a;

2. Find the value of $b

Copy the code The code is as follows:

$a = 1;
$x = &$a;
$ b = $a++;
echo $b;

3. Write a function to delete the specified directory including all subdirectories and files under it
4. Write a function to calculate the relative paths of two files, such as:
$a = '/a/b/c/d/e.php';
　$b = '/a/b/12/34/c.php';
Javascript basic knowledge part
1. Talk about js implementation inheritance Several ways, and write a demo
2. Talk about the js framework you are familiar with, and implement the acquisition of the following DOM elements

< ;div drag="true" index="2">

Required to find drag="true" and index="1" or div without index attribute
Tips: If you cannot write it out at once, please complete the following steps
1. Find drag="true" and index="1"
2. Find drag="true" and no index attribute
3. Connect the two to get
3. Implement a mask layer effect, requiring the elements to be displayed to be centered on the page
4. Closure knowledge inspection

Copy the code The code is as follows:

function step (a){
return function(x){
return x+a++;
}
}
var a = step(10);
var b = step(20);
alert(a(10));
alert (b(20));
var a="123abc";
alert(typeof(a++));
alert(a);

MySQL knowledge part
1. In a certain content management system, the message table has the following fields
id article id
title article title
content article content
category_id article category id
hits clicks
Create the above table and write the MySQL statement
2. Same as the above content management system: the table comment records user reply content, the fields are as follows
comment_id Reply id
id article id, associated with the id in the message table
comment_content reply content
Now we need to query the database to get a list of article titles in the following format, and sort them according to the number of replies, with the highest reply at the top
Article id article title click Measure the number of replies
Use a SQL statement to complete the above query. If the article has no reply, the number of replies will be displayed as 0
3. In the above content management system, the category information is saved in the table category, and the fields are as follows
category_id int(4) not null auto_increment;
categroy_name varchar(40) not null;
When the user enters an article, select the article category by selecting the drop-down menu
Write how to implement this drop-down menu [PHP, JAVASCRIPT, HTML can be used]
Mysql knowledge expansion part
4. The system needs to classify The table is expanded so that it can support unlimited levels of classification. Please design this table structure and complete the following scenarios according to your design
1. Find all articles under the specified category (including all articles under subcategories)
2. Find the category of the specified article to the level of the root category, for example:
The article "Mysql Optimization Experience" corresponds to "Programming/Mysql/Operation and Maintenance/"
3. When deleting a category, it is required to also delete all subcategories under it
5. The system needs to add a tag function to articles (tags and articles are in a many-to-many relationship) to implement the "related articles" function. Please design this table structure,
and complete the following scenario according to your design.
1 . Find the five articles that are closest to the specified article (the similarity algorithm is based on the number of the same tags, the larger the number, the more similar it is)
Comprehensive knowledge part:
1. Talk about your understanding of Cookie and Session, they What are the applicable scenarios? If possible, can you elaborate on how to share sessions in multiple applications? 2. Talk about your understanding of single sign-on, such as its principles and implementation, and what issues need to be paid attention to during the implementation process? 3. Talk about your understanding of MVC, what are the shortcomings of MVC, if you were asked to implement an MVC framework, how would you like to implement it?
4. Talk about the permission management part you use in your daily work, how do you understand it and Realized?
The above introduces the interview questions. A collection of PHP interview questions compiled by Sese, including the content of interview questions. I hope it will be helpful to friends who are interested in PHP tutorials.