<?php

$data = file_get_contents('https://gist.githubusercontent'
    . '.com/jorostoyanov/17b41811d85e9cb81351eecffd81efec/raw/'
    . '473a25c450161a22f0adcba841c230ba9ef83b40/employees.json');

$data = json_decode($data, true);

function get_employees_names($data) {
    return array_column($data, 'name');
}

function get_salary_range($data) {
    $result = [];

    $result['min'] = $result['max'] = $data[0]['salary'];

    foreach ($data as $employee) {
        if ($employee['salary'] < $result['min']) {
            $result['min'] = $employee['salary'];
        }

        if ($employee['salary'] > $result['max']) {
            $result['max'] = $employee['salary'];
        }
    }

    return $result;
}

function get_positions($data) {
    $positions = [];

    foreach ($data as $employee) {
        if (!array_key_exists($employee['position'], $positions)) {
            $positions[$employee['position']] = 1;
            continue;
        }

        $positions[$employee['position']]++;
    }

    return $positions;
}

function get_teams($data) {
    $teams = [];

    foreach ($data as $employee) {
        if (!array_key_exists($employee['team'], $teams)) {
            $teams[$employee['team']] = [];
        }

        $teams[$employee['team']][] = [
            'name' => $employee['name'],
            'position' => $employee['position'],
            'salary' => $employee['salary'],
        ];
    }

    return $teams;
}