Test tasks

**
Сollections**

You need to write a collection class (which can be used in a foreach construct). The class inherits the iterator interface, that is, it necessarily implements methods:

• __construct(array $items),
• prev,
• next,
• current,
• rewind (method rewind returns a pointer to the first element of the collection).

Add an array [1,2,3,4,5,6,7,8,9,10] to the collection.

In the loop, run through the collection and calculate the sum of the elements.

Students & classes

There are tables:

id	First name	Last name
1	Bob	Biden
2	Joey	Johnsen
3	Mike	Buffollo

Classes:

id	title
1	A
2	B

Students_Classes

id	class_id	student_id
1	1	1
2	1	2
3	2	3

You need to write a SQL query that displays the id of the class, its name and the number of students in the class, that is:

id

title

student_count

API Development

Task: Create a simple REST API endpoint in PHP that returns a JSON response with a list of users from the users table.

Additional Test tasks

Basic Node.js Knowledge

Create a Node.js application that serves a simple webpage. The webpage should display a list of users fetched from a JSON file.

Basic Understanding of Server Software (Apache, Nginx)

Write a basic configuration for an Nginx server with https redirect that serves a PHP application.

Basic Understanding of Linux Servers

This task will assess your fundamental knowledge of Linux server management, including basic command-line operations, file system navigation, user management, and basic network configuration. Give the list of bash commands for each subtask.

Task Instructions:

1. Connecting to a Linux Server:
   • Use SSH to connect to a remote Linux server. Assume the server's IP address is 192.168.1.10 and the SSH port is the default one.
2. File System Navigation:
   • Once connected, navigate to the /var/log directory.
   • List all files and directories within /var/log and save the output to a file named log_list.txt in your home directory.
3. User Management:
   • Create a new user named testuser without a home directory.
4. File Permissions:
   • Create a directory named testdir in your home directory.
   • Change the permissions of testdir to allow read, write, and execute access only to the owner.
5. Basic Network Configuration:
   • Display the current network configuration, including IP addresses and network interfaces.
6. Package Management:
   • Update the package list on the server and install the curl package.