add Collection and Student and classes

Collection.php

@@ -0,0 +1,51 @@
+<?php
+
+class Collection implements Iterator {
+    private int $cursor = 0;
+
+    public function __construct(
+    	private array $items = []
+    ) {}
+
+	#[ReturnTypeWillChange]
+    public function current(): int
+    {
+        return $this->items[$this->cursor];
+    }
+	#[ReturnTypeWillChange]
+    public function key(): int
+    {
+        return $this->cursor;
+    }
+
+	#[ReturnTypeWillChange]
+    public function next(): void
+    {
+        ++$this->cursor;
+    }
+
+	#[ReturnTypeWillChange]
+    public function prev(): int {
+        --$this->cursor;
+    }
+
+    public function rewind(): void {
+        $this->cursor = 0;
+    }
+
+    public function valid(): bool
+    {
+        return isset($this->items[$this->cursor]);
+    }
+}
+
+// Adding an array [1,2,3,4,5,6,7,8,9,10] to the collection
+$collection = new Collection([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+
+// Calculating the sum of the elements in the collection
+$sum = 0;
+foreach ($collection as $item) {
+    $sum += $item;
+}
+
+echo "The sum of the elements in the collection is: $sum\n";

README.md

@@ -0,0 +1,177 @@
+**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.

StudentAndClasses.sql

@@ -0,0 +1,10 @@
+SELECT 
+    c.id, 
+    c.title, 
+    COUNT(sc.student_id) AS student_count
+FROM 
+    Classes c
+LEFT JOIN 
+    Students_Classes sc ON c.id = sc.class_id
+GROUP BY 
+    c.id, c.title;