// Ajouter select2 à l'admin
function enqueue_select2_jquery() {
	wp_register_style('select2css', '//cdnjs.cloudflare.com/ajax/libs/select2/3.4.8/select2.css', false, '1.0', 'all');
	wp_register_script('select2', '//cdnjs.cloudflare.com/ajax/libs/select2/3.4.8/select2.js', array('jquery'), '1.0', true);
	wp_enqueue_style('select2css');
	wp_enqueue_script('select2');
}
add_action('admin_enqueue_scripts', 'enqueue_select2_jquery');
function custom_admin_js_css() {
	echo '<script>
			jQuery(document).ready(function($) {
				$(\'[name="post_author_override"]\').select2();
			});
		</script>
		<style>
			.select2-container {
				width:100%;
			}
		</style>';
}
add_action('admin_footer', 'custom_admin_js_css');