How to wrap a div every 3 entries?

Question

PHP

There is the following record output

<?php
$query = new WP_Query('cat=9'); 
if( $query->have_posts() ){
  while( $query->have_posts() ){ $query->the_post();
  ?>
    <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
    <?php the_content(); ?>

  <?php
  }
  wp_reset_postdata(); 
} 
else echo 'Записей нет.';
?>

It is necessary to wrap every three records in one div (container). How to do?

Answer 1

PHP has Modulo and WP_Query has $current_post:

if ( $query->current_post % 3 === 0 ) {
    ... // тут див
}

From memory, $current_post seems to start at 0, so it's possible:

$current = $query->current_post + 1;
if ( $current % 3 === 0 ) {
    ... // тут див
}

Answer 2

It's easy to do it.
Learn what a cycle is. Find out what a variable is an integer. Go to class 1 to learn how to add 1 + 1 to get 3. Go to second class to learn how to divide any number by 3. and then figure it out