wordpress处理与WP_Query类型相关的ACF自定义字段

因为你在寻找 string 在一个 object

使用WP_查询参数

可以只加载选定的post id,而不是post对象。这样,您可以在WP_查询中使用id并指定参数,如posts_per_page、order和orderby。要了解有关WP_查询参数的更多信息,请阅读 http://codex.wordpress.org/Class_Reference/WP_Query#Parameters .

<?php 

// get only first 3 results
$ids = get_field('conference_talks', false, false);

$query = new WP_Query(array(
    'post_type'         => 'conferences',
    'posts_per_page'    => 3,
    'post__in'          => $ids,
    'post_status'       => 'any',
    'orderby'           => 'post__in',
));

?>

资料来源: https://www.advancedcustomfields.com/resources/relationship/

我找到了解决办法: WordPress query posts by ACF

'value' 'compare' 参数,从这里:

'value' =>'22',
'compare' => '=',

'value' =>'"'.'22'.'"',
'compare' => 'LIKE',

编辑:

'value' => '22',
'compare' => 'LIKE',

这是完整的代码

function get_id_list ($postType) {
    $wpb_all_query = new WP_Query(
        array(
            'post_type' => $postType,
            'post_status' => 'publish',
            'posts_per_page' => -1,
            'meta_query' => array(
                array(
                    'key' => 'bicslab_axis',
                    'value' => '22',
                    'compare' => 'LIKE',

                )
            )
        )
    );
    $postIDList = [];
    if($wpb_all_query->have_posts()){
        while ( $wpb_all_query->have_posts() ) {
            $wpb_all_query->the_post();
            $postIDList[] = get_the_ID();
        }
        wp_reset_postdata();
    }
    print_r($postIDList);
    return $postIDList;
}