用数组更新 post 元数据而不嵌套

Update post meta with array without being nested

如果将逗号分隔数组转换为普通数组并更新 wordpress 中的 post 元数据,我会得到一个不需要的额外嵌套数组层。有谁知道如何解决这一问题?或者在更新 post 元数据之前转换数组?

$array_1 = array (
  0 => '6801,6800,7310,6795',
);

$array_2 = array();

foreach ($array_1 as $value) {

    array_push($array_2 , explode(",",$value));
}

update_post_meta($post->ID, 'post_meta_field', $array_2);

//print_r($array_2);

}
add_action( 'save_post', 'my_save_post_function', 10, 3 );

输出如下:

array (
  0 =>  // I don't need this layer!!
  array (
    0 => 
    array (
      0 => '6801',
      1 => '6800',
      2 => '7310',
      3 => '6795',
    ),
  ),
)

但我需要这个:

   array (
        0 => 
        array (
          0 => '6801',
          1 => '6800',
          2 => '7310',
          3 => '6795',
        ),
    )

假设您需要所有逻辑来在实际代码中生成数组,您可以简单地挑选出最外层数组的第一个元素:

update_post_meta($post->ID, 'post_meta_field', $array_2[0]);