**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:


<table>
  <tr>
   <td>id
   </td>
   <td>First name
   </td>
   <td>Last name
   </td>
  </tr>
  <tr>
   <td>1
   </td>
   <td>Bob
   </td>
   <td>Biden
   </td>
  </tr>
  <tr>
   <td>2
   </td>
   <td>Joey
   </td>
   <td>Johnsen
   </td>
  </tr>
  <tr>
   <td>3
   </td>
   <td>Mike
   </td>
   <td>Buffollo
   </td>
  </tr>
</table>


Classes:


<table>
  <tr>
   <td>id
   </td>
   <td>title
   </td>
  </tr>
  <tr>
   <td>1
   </td>
   <td>A
   </td>
  </tr>
  <tr>
   <td>2
   </td>
   <td>B
   </td>
  </tr>
</table>


Students_Classes


<table>
  <tr>
   <td>id
   </td>
   <td>class_id
   </td>
   <td>student_id
   </td>
  </tr>
  <tr>
   <td>1
   </td>
   <td>1
   </td>
   <td>1
   </td>
  </tr>
  <tr>
   <td>2
   </td>
   <td>1
   </td>
   <td>2
   </td>
  </tr>
  <tr>
   <td>3
   </td>
   <td>2
   </td>
   <td>3
   </td>
  </tr>
</table>


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:


<table>
  <tr>
   <td>id
   </td>
   <td>title
   </td>
   <td>student_count
   </td>
  </tr>
</table>



#### **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.