<?php

$array = include __DIR__ . '/massiv.php';

function getUsersList($array) {
return $array;
}

function existsUser($login, $array){

$login = 'vasya';
array_key_exists($login, $array);
}

function сheckPassword($login, $password, $array ){

$hash = $users['vasya'];

if (password_verify($password, $hash)) {
    if (existsUser($login, $array)) {
        return true;
    }

}
}

?>