我在开发模式中得到了以下警告：

警告：join（）：在/webDir/project/wp includes/post模板中传递的参数无效。php在线371

在生产模式中<article> 类属性变为空(class="").此错误对应于下一个函数：

/**
 * Display the classes for the post div.
 *
 * @since 2.7.0
 *
 * @param string|array $class One or more classes to add to the class list.
 * @param int|WP_Post $post_id Optional. Post ID or post object.
 */
function post_class( $class = \'\', $post_id = null ) {
    // Separates classes with a single space, collates classes for post DIV
    echo \'class="\' . join( \' \', get_post_class( $class, $post_id ) ) . \'"\';
}

经过一段时间的调试，我在下一个自定义函数（functions.php）中发现了问题：

/* Remove hentry class from "contact" page */

if(! function_exists( \'remove_hentry\' )) {
    function remove_hentry( $classes ) {
        $classes[] = customTheme_layout_class();
        if(is_page(\'contact\')) {            
            $classes = array_diff($classes, array("hentry"));

            return $classes;
        }
    }

    add_filter( \'post_class\', \'remove_hentry\' );
}

删除这些行后，警告将消失<article> 类别显示正确。customTheme_layout_class() 是具有下一个代码的主题函数：

/* ------------------------------------------------------------------------- *
 *  Template functions
/* ------------------------------------------------------------------------- */ 

/*  Layout class
/* ------------------------------------ */
if ( ! function_exists( \'customTheme_layout_class\' ) ) {

    function customTheme_layout_class() {
        // Default layout
        $layout = \'col-3cm\';
        $default = \'col-3cm\';

        // Check for page/post specific layout
        if ( is_page() || is_single() ) {
            // Reset post data
            wp_reset_postdata();
            global $post;
            // Get meta
            $meta = get_post_meta($post->ID,\'_layout\',true);
            // Get if set and not set to inherit
            if ( isset($meta) && !empty($meta) && $meta != \'inherit\' ) { $layout = $meta; }
            // Else check for page-global / single-global
            elseif ( is_single() && ( ot_get_option(\'layout-single\') !=\'inherit\' ) ) $layout = ot_get_option(\'layout-single\',\'\'.$default.\'\');
            elseif ( is_page() && ( ot_get_option(\'layout-page\') !=\'inherit\' ) ) $layout = ot_get_option(\'layout-page\',\'\'.$default.\'\');
            // Else get global option
            else $layout = ot_get_option(\'layout-global\',\'\'.$default.\'\');
        }

        // Set layout based on page
        elseif ( is_home() && ( ot_get_option(\'layout-home\') !=\'inherit\' ) ) $layout = ot_get_option(\'layout-home\',\'\'.$default.\'\');
        elseif ( is_category() && ( ot_get_option(\'layout-archive-category\') !=\'inherit\' ) ) $layout = ot_get_option(\'layout-archive-category\',\'\'.$default.\'\');
        elseif ( is_archive() && ( ot_get_option(\'layout-archive\') !=\'inherit\' ) ) $layout = ot_get_option(\'layout-archive\',\'\'.$default.\'\');
        elseif ( is_search() && ( ot_get_option(\'layout-search\') !=\'inherit\' ) ) $layout = ot_get_option(\'layout-search\',\'\'.$default.\'\');
        elseif ( is_404() && ( ot_get_option(\'layout-404\') !=\'inherit\' ) ) $layout = ot_get_option(\'layout-404\',\'\'.$default.\'\');

        // Global option
        else $layout = ot_get_option(\'layout-global\',\'\'.$default.\'\');

        // Return layout class
        return $layout;
    }

}

知道我的自定义函数有什么错误吗(remove_hentry)?

if(! function_exists( \'remove_hentry\' )) {
    function remove_hentry( $classes ) {
        $classes[] = customTheme_layout_class();
        if( is_page(\'contact\') ) {            
            $classes = array_diff( $classes, array( "hentry" ) );
        }
        return $classes;
    }

    add_filter( \'post_class\', \'remove_hentry\' );
}