我用它成功地插入了带有ACF/Posteta数据的帖子，但请在部署live之前在开发站点上测试它，可能会有一些可怕的假设。通常，它假设每个名称只有一次，即“myfield”不存在于两个含义不同的字段组中。

$mycustomvalue = 123;
$f_mycustomfield = get_acf_key_by_name("mycustomfield");
update_post_meta( $postid, "mycustomfield", $mycustomvalue );
update_post_meta( $postid, "_mycustomfield", $f_mycustomfield["key"] );


function load_acf_names2key() {
    global $acf_names2key;
    $acf_names2key = array();
    $posts = get_posts(array(
        \'numberposts\'   => -1,
        \'post_type\'     => \'acf\',
        \'orderby\'       => \'menu_order title\',
        \'order\'         => \'asc\',
        \'suppress_filters\' => false,
    ));
    foreach($posts as $fieldgroup) {
        $fields = get_post_meta( $fieldgroup->ID );
        foreach($fields as $fieldkey => $fieldmeta) {
            if(substr($fieldkey, 0, 6) == "field_") {
                $field = get_post_meta( $fieldgroup->ID, $fieldkey);
                foreach($field as $subfield) {
                    if(!array_key_exists($subfield["name"], $acf_names2key)) $acf_names2key[ $subfield["name"] ] = array();
                    $subfield[ "group" ] = $fieldgroup->post_name;
                    array_push( $acf_names2key[ $subfield["name"] ], $subfield );
                }
            }
        }
    }
}

function get_acf_key_by_name($name, $options = array()) {
    global $acf_names2key;
    if(!$acf_names2key || !is_array($acf_names2key) || count($acf_names2key) == 0) {
        load_acf_names2key();
    }
    if(!array_key_exists($name, $acf_names2key))
        return false;
    foreach($acf_names2key[ $name ] as $possible) {
        foreach($options as $key => $val) {
            if(preg_match("!^/.*/i?$!", $val)) {
                if(!preg_match($val, $possible[ $key ])) {
                    continue 2;
                }
            }
            else if($possible[ $key ] != $val) {
                continue 2;
            }
        }
        # no options? this will return the first one
        # has options? will return the first item that
        #     satisfies all options
        return $possible;
    }
    return false;
}

我写这篇文章已经有很长一段时间了，但我记忆犹新，我到底想用那些可以传递给的$选项做什么get_acf_key_by_name （或者如果我只是从某处复制粘贴的代码），但它总是对我有用。我还没有尝试使用转发器字段，所以这可能是一个挑战，但请尝试一下。