global $current_user;

                            $user_roles = $current_user->roles;

                            $user_role_query = array();

                            for ($i=0; $i < sizeof($user_roles); $i++) {
                                $user_role_query[] = array('key'=>'attribution_roles', 'value' => $user_roles[$i], 'compare'=>'LIKE');
                            }

                        // WP_Query arguments
                        $args = array (
                            'post_type'              => 'suivi_des_comites',
                            'order'                  => 'ASC',
                            'orderby'                => 'title',
                            'posts_per_page'        => -1,
                            'meta_query'            => array_merge(
                                    array( 'relation' => 'OR' ),    // this must be an array
                                    $user_role_query
                                )
                        );

Array
(
    [0] => Array
        (
            [key] => attribution_roles
            [value] => aptnb
            [compare] => LIKE
        )

)

Array
(
    [post_type] => suivi_des_comites
    [order] => ASC
    [orderby] => title
    [posts_per_page] => -1
    [meta_query] => Array
        (
            [relation] => OR
            [0] => Array
                (
                    [key] => attribution_roles
                    [value] => aptnb
                    [compare] => LIKE
                )

        )

)

a:2:{i:0;s:8:"aptnb_ca";i:1;s:13:"administrator";}