php foreach wrap every 2 divs

Answer 1

You can take advantage of array_chunk :

//First make a generator to get all books
function allBooks($contents) {
    foreach($contents as $content) {    
        foreach($content['tags'] as $book) {
            yield $book; //Here you can yield whatever you want !
        }
    }
}

//Then create rows
$itemPerRow = 2;
$rows = array_chunk(iterator_to_array(allBooks($contents)), $itemPerRow, true);

//Display all 
foreach($rows as $row) {
   echo '';
      foreach($row as $book) {
         //Display the book !
      }
   echo '';
}