WordPress 技巧：限制素材数量

add_filter('wp_handle_upload_prefilter', function($file){
	$counts	= wp_count_posts('attachment');
	$total	= array_sum((array)$counts);

	if($total > WPJAM_ShopCountLimit::get_limit('attachment')){
		$error	= WPJAM_ShopCountLimit::get_error('attachment');
		$file['error']	= $error->get_error_message();
	}

	return $file;
});