Create new posts with unique authors

functions.php

add_action( 'init', function() {
	return;
	$users = graphql([
		'query' => '
		{
		  users(first:100) {
		    nodes {
		      databaseId
		    }
		  }
		}
		'
	]);

	$ids = isset( $users['data']['users']['nodes'] ) ? array_filter( array_map( static function( $user ) {
		return $user['databaseId'] ?? null;
	}, $users['data']['users']['nodes'])) : [];

	foreach ( $ids as $user_id ) {

		wp_insert_post([
			'post_type' => 'post',
			'post_status' => 'publish',
			'post_author' => $user_id,
			'post_title' => 'Test July 26 - ' . $user_id,
			'post_content' => 'test',
		]);

	}

} );

For testing sake, I needed to create 100 new posts each with a different author.

Using GraphQL I was able to query for 100 users, loop over their databaseId, then pass that to wp_insert_post to create 100 new posts each with a different author.