TestPHP created by Ulvac - https://repl.it/@Ulvac/TestPHP

main.php

<?php

echo "-------------------------------задание 1--------------------------\n";

$authors = 
[
  ["name" => "ivan ivanov",
  "email" => "ivan@mail.hell",
  "birthday" => "1888",
  "books" =>  [
                ["name" => 'mertvec',
                "publishing" => 1907,],
                ["name" => 'mertvec2',
                "publishing" => 1909,]        
              ]
  ],
  ["name" => "vasja ivanov",
  "email" => "vasja@mail.hell",
  "birthday" => "1889",
  "books" =>  [
                ["name" => 'den1',
                "publishing" => 1933,],
                ["name" => 'den2',
                "publishing" => 1935,]        
              ]
  ],
  ["name" => "petr ivanov",
  "email" => "petr@mail.hell",
  "birthday" => "1898",
  "books" =>  [
                ["name" => 'noch',
                "publishing" => 1921,],
                ["name" => 'noch2',
                "publishing" => 1922,]        
              ]
  ]
];

echo "Авторы : \n";

foreach ($authors as $author)  
{
  echo $author['name'] . " - " . $author['email'] . " - " . $author['birthday'] . "\n";
}

echo "Книги : \n";

foreach ($authors as $books)  
{
  foreach ($books['books'] as $book)
  {
    echo $book["name"] . " - " . $books["name"] . " - " . $book["publishing"] . "\n";
  }
}

echo "-------------------------------задание 2--------------------------\n";

$items = ['where','is','my','money'];
$sum = 0;
$a = 3;
$b = 5;

for($i = 0; $i <= 100; $i++)  
{ 
  if ($i % ($a * $b) == 0)
  {
    shuffle($items);
    continue;
  }

  if ($i % $a == 0) 
  {
    echo " любая не пустая строка \n";
    continue;
  }

  if ($i % $b == 0) 
  {
    $sum += $i;
  }
}

foreach ($items as $element)
{
  echo $element . " ";
}

?>