Get posts from all blogs in multisite WordPress with pagination

get-posts-from-all-blogs-in-multisite-wordpress-with-pagination.php

<?php

//Querying all posts in the argument
$args = [
	'post_type'      => 'post',
	'order'          => 'DESC',
	'category_name'  => 'news',
	'posts_per_page' => 999,
	'post_status'    => 'publish'
];

//Setting up a query
$query = new WP_Query( $args );

//Listing all site ID's
$sites = [ 1, 2 ];

//Setting up empty array list
$all_posts = [];

// Looping all the sites and compiling posts in the array $all_posts
foreach ( $sites as $site ) {

	switch_to_blog( $site );
	$posts = get_posts( $args );

	foreach ( $posts as $post ) {
		// Better get the post's permalink, since it's site-dependent
		$post->permalink = get_permalink( $post->ID );
		$post->thumbnail = get_the_post_thumbnail_url( $post->ID, 'thumbnail' );
		$all_posts[]     = $post;
	}
	//restoring to the default blog
	restore_current_blog();
}

//sorting posts using the sort function
$all_posts = wp_list_sort( $all_posts, 'post_date', 'DESC' );

//manually setting the number of page articles
$nb_elem_per_page = 5;

//manually setting the $paged item
$page = get_query_var( 'paged' ) ? intval( get_query_var( 'paged' ) ) : 1;

//calculating the number of paged elements
$posts_per_page = intval( ceil( count( $all_posts ) / $nb_elem_per_page ) );

if ( $page === 1 ) {
	$company_news = array_slice( $all_posts, 0, $nb_elem_per_page );
} else {
	$company_news = array_slice( $all_posts, ( $page - 1 ) * $nb_elem_per_page, $nb_elem_per_page );
}

?>

<section class="press-section">

	<div class="quotes_wrapper">
		
		<?php
		//displaying all posts with pagination to follow
		foreach ( $company_news as $quote ) {
			setup_postdata( $quote );
			?>

			<article class="single_quote flx mob-no-flex pb-40">

				<div class="quote_meta w-100">

					<?php if ( $quote->thumbnail ): ?>

						<a class="no_underline quote_thumb" href="<?= $quote->permalink; ?>">
							<img class="quote_thumb_img lazyload l-border b-radius-15 trans-all-300" data-src="<?= $quote->thumbnail ?>" data-placeholder-background="#FFFFFF" alt="<?= $quote->post_title; ?>" width="248" height="156">
						</a>

					<?php endif; ?>

				</div>

				<div class="quote_details">
					<h2 class="quote_headline">
						<a class="no_underline blueberry" href="<?= $quote->permalink; ?>"><?= $quote->post_title; ?></a>
					</h2>

					<?php if ( $quote->post_excerpt ) : ?>
						<div class="quote_text fw-300 mt-20 mb-15 pl-0 no-before">
							<?= $quote->post_excerpt; ?>
						</div>
					<?php endif; ?>

					<p class="date grey mt-0 fs-16"><?= date( 'M j, Y', strtotime( $quote->post_date ) ) ?></p>

				</div>

			</article>

			<?php wp_reset_query();
		}


if ( $args['total'] && $args['page'] ) { ?>

  <div class="quotes_pagination flx centered h-center v-center fs-16">

	  <?= wp_kses_post(
		  paginate_links(
			  [
				  'current'  => $args['page'],
				  'total'    => $args['total'],
				  'show_all' => true,
			  ]
		  )
	  ); ?>

  </div>

<?php } ?>
	</div>

</section>

Hey,

$args['total'] and $args['page'] variables has null.