<?php
/**************************************************************/
$p_books = [
        ["Руслан и Людмила","1820"],
        ["Кавказский пленник", "1821"],
        ["Пиковая дама","1834"],
        ["Барышня-крестьянка","1830"],
        ["История Пугачёва","1834"]
    ];
$g_books = [
        ["Мёртвые души","1842"],
        ["Записки сумасшедшего", "1835"],
        ["Вий", "1835"],
        ["Нос", "1833"],
        ["Ревизор", "1856"]
    ];
$t_books = [
        ["Война и мир", "1820"],
        ["Анна Каренина", "1876"],
        ["Чем люди живы", "1881"],
        [ "Корней Васильев", "1905"],
        ["Старик в церкви", "1907"]
    ];
/************************************************************/
    $authors = [
        ["Пушкин Александр","1799","[email protected]",$p_books],
        ["Гоголь Николай","1852","[email protected]",$g_books],
        ["Толстой Лев","1828","[email protected]",$t_books]
    ];
 /***********************************************************/
foreach($authors as $author) {
    for ($i=0; $i < count($authors); $i++) {
       echo "$author[$i] \r\n";
    }
    echo "#################################################\r\n";
}
foreach($authors as $author) {
    foreach ($author[3] as $books) {
        echo "$author[0]",  " - $books[1]" , " - $books[0]\r\n";
    }
        echo "#################################################\r\n";
}

?>