我正在尝试用自定义帖子类型“color”的数组填充下拉字段
使用此：https://www.gravityhelp.com/documentation/article/dynamically-populating-drop-down-fields/

add_filter( \'gform_pre_render_51\', \'color_posts\' );
add_filter( \'gform_pre_validation_51\', \'color_posts\' );
add_filter( \'gform_pre_submission_filter_51\', \'color_posts\' );
add_filter( \'gform_admin_pre_render_51\', \'color_posts\' );
function color_posts( $form ) {

foreach ( $form[\'fields\'] as &$field ) {

    if ( $field->type != \'select\' || strpos( $field->cssClass, \'color_posts\' ) === false ) {
        continue;
    }

    // you can add additional parameters here to alter the posts that are retrieved
    // more info: [http://codex.wordpress.org/Template_Tags/get_posts](http://codex.wordpress.org/Template_Tags/get_posts)
    $args = array( \'post_type\' => \'color\' );
    $posts = get_posts( $args );

    $choices = array();

    foreach ( $posts as $post ) {
        $choices[] = array( \'text\' => $post->post_title, \'value\' => $post->post_title );
    }

    // update \'Select a Post\' to whatever you\'d like the instructive option to be
    $field->placeholder = \'Select a Post\';
    $field->choices = $choices;

}

return $form;
}

但即使我将自定义css样式设置为“color\\u posts”，也不会发生任何事情。任何我做错的事情，或者我可以用不同的方式来做。