Cacher is the code snippet organizer for pro developers

<?php
$loop = new WP_Query( array(
    'post_type' => 'page',
    'posts_per_page' => -1
  )
);
?>

<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
	<?php
	$title = get_the_title();
	$my_post = array(
		'ID'           => get_the_ID(),
		'post_title'   => explode(" ", get_the_title())[0],
	);
	wp_update_post( $my_post );

	 ?>
<?php endwhile; wp_reset_query(); ?>