What is the pre_get_posts hook?

pre_get_posts gives you the WP_Query object before the database is asked. You can change its arguments with $query->set(). Always check that it is the main query, and not in the admin, or you will change other queries by mistake.

<?php
add_action( 'pre_get_posts', function ( $query ) {
	if ( ! is_admin() && $query->is_main_query() && $query->is_home() ) {
		$query->set( 'posts_per_page', 2 );
	}
} );

The home page lists only two posts now (without the hook it shows ten). Use it also for custom post types in archives, search results or to change the order.

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