按多个meta键和meta值排序

如何通过元值设置多个元键顺序，谁能给我一些例子？

meta_query是元条款的数组。例如：

$q = new WP_Query( array(
    'meta_query' => array(
        'relation' => 'AND',
        array(
            'key' => 'state',
            'value' => 'Wisconsin',
        ),
        array(
            'key' => 'city',
            'compare' => 'EXISTS',
        ), 
    ),
) );

您可以使用关联数组，并为每个meta子句添加一个键：

$q = new WP_Query( array(
    'meta_query' => array(
        'relation' => 'AND',
        'state_clause' => array(
            'key' => 'state',
            'value' => 'Wisconsin',
        ),
        'city_clause' => array(
            'key' => 'city',
            'compare' => 'EXISTS',
        ), 
    ),
) );

然后，您可以在order_by参数中使用以下键：

$q = new WP_Query( array(
    'meta_query' => array(
        'relation' => 'AND',
        'state_clause' => array(
            'key' => 'state',
            'value' => 'Wisconsin',
        ),
        'city_clause' => array(
            'key' => 'city',
            'compare' => 'EXISTS',
        ), 
    ),
    'orderby' => 'city_clause', // Results will be ordered by 'city' meta values.
) );

或更多条款：

$q = new WP_Query( array(
    'meta_query' => array(
        'relation' => 'AND',
        'state_clause' => array(
            'key' => 'state',
            'value' => 'Wisconsin',
        ),
        'city_clause' => array(
            'key' => 'city',
            'compare' => 'EXISTS',
        ), 
    ),
    'orderby' => array( 
        'city_clause' => 'ASC',
        'state_clause' => 'DESC',
    ),
) );

摘自Make WordPres Core博客中的帖子示例。