How to Ordering by user meta

<?php
$args = array(
    'orderby' => 'meta_value',
    'meta_key' => 'last_name',
    'order'   => 'ASC'
);
$users = get_users( $args );
echo '<ul>';
foreach ( $users as $user ) {
    echo '<li>' . $user->first_name .' '. $user->last_name . '</li>';
}
echo '</ul>';
?>

Something like that?

Thanks @tugbucket . I used like this.

`if($_POST['orga_id']) {
		$users_query = array(
			'meta_query' => array(
				'relation' => 'AND',
				array(
					'relation' => 'OR',
					array(
						'key'     => 'first_name',
						'value'   => $_POST['search'],
						'compare' => 'LIKE'
					),
					array(
						'key' 		=> 'last_name',
						'value' 	=> $_POST['search'],
						'compare' 	=> 'LIKE',
					),
				),
				array(
					'key' 		=> 'organisation',
					'value' 	=> $_POST['orga_id'],
					'compare' 	=> 'LIKE',
				),
				array(
					'key' 		=> 'available',
					'value' 	=>  1,
					'compare' 	=> '=',
				),
				array(
					'orderby' => 'meta_value',
					'meta_key' => 'last_name',
					'order' => 'ASC',
				),
				array(
					'orderby' => 'meta_value',
					'meta_key' => 'first_name',
					'order' => 'ASC',
				),
			)
		);
	} else {
		$users_query = array(
			'meta_query' => array(
				'relation' => 'AND',
				array(
					'relation' => 'OR',
					array(
						'key'     => 'first_name',
						'value'   => $_POST['search'],
						'compare' => 'LIKE'
					),
					array(
						'key' 		=> 'last_name',
						'value' 	=> $_POST['search'],
						'compare' 	=> 'LIKE',
					),
				),
				array(
					'key' 		=> 'available',
					'value' 	=>  1,
					'compare' 	=> '=',
				),
				array(
					'orderby' => 'meta_value',
					'meta_key' => 'last_name',
					'order' => 'ASC',
				),
				array(
					'orderby' => 'meta_value',
					'meta_key' => 'first_name',
					'order' => 'ASC',
				),			
			)
		);
	}

But I am not getting last_name & first_name as output.

@mabufoysal Looks like you have a lot going on in that code so it’s hard for to test. What does print_r($users_query); result in?

Here is an example sort by multiple meta keys

$args = array(
    'meta_query' => array(
        'relation' => 'AND',
        'query_one' => array(
            'key' => 'key_one',
            'value' => 'value_one', // Optional
        ),
        'query_two' => array(
            'key' => 'key_two',
            'compare' => 'EXISTS', // Optional
        ), 
    ),
    'orderby' => array( 
        'query_one' => 'ASC',
        'query_two' => 'DESC',
    ),
);