我有一个重复字段，它将文本项存储在一个数组中，如下所示：

[0] => 
[1] => NUC Lights
[2] => Smoke Alarm
[3] => Binoculars

您将注意到键A没有值，并且它们没有按字母顺序排列。我要做的是获取上面的数组，删除空值，对其排序，然后按如下方式重新保存：

[0] => Binoculars
[1] => NUC Lights
[2] => Smoke Alarm

这是我当前的代码：

// Post Types to include
$post_args = array(
    \'posts_per_page\' => -1,
    \'post_type\' => array(
        \'boat\'
    ),
);

// The Query
$post_query = new WP_Query( $post_args );
$posts = $post_query->posts;

foreach($posts as $post) {

    $boat_safety_terms = get_post_meta( $post->ID, \'wpcf-all-safety-terms\', false );
    $boat_safety_terms_cleaned = array_filter( $boat_safety_terms );
    $boat_safety_terms_cleaned_sorted = sort( $boat_safety_terms_cleaned );

    error_log( print_r( $boat_safety_terms_cleaned_sorted, TRUE ) );

}

但我的日志只显示1 因为某种原因，每艘船都有。知道它可能出了什么问题吗？

另外，我想我会使用update_post_meta 要将阵列保存回字段？

$boat_safety_terms_cleaned_sorted = sort( $boat_safety_terms_cleaned );
error_log( print_r( $boat_safety_terms_cleaned_sorted, TRUE ) );

sort( $boat_safety_terms_cleaned );
error_log( print_r( $boat_safety_terms_cleaned, TRUE ) );