在调试 .log 文件中找不到自定义函数

问：

我正在创建一个插件，它用于联系表单，它们有文件字段，我将该文件保存在自定义文件夹中，为此我使用名为“aaiof_upload_dir”的函数，但在调试中.log它说函数不是 found.my 代码在下面。

remove_filter（'upload_dir'， 'aaiof_upload_dir'）; `add_filter('upload_dir', 'aaiof_upload_dir'); //define function of aaior_upload_dir$movefile = wp_handle_upload( $uploadedfile, $upload_overrides ); //using for upload file in default uploads folder

if (!function_exists( 'aaiof_upload_dir')){
        function aaiof_upload_dir($upload) {
            $upload['subdir'] = '/contact_form';      
            $upload['path']   = $upload['basedir'] . $upload['subdir'];    
            $upload['url']    = $upload['baseurl'] . $upload['subdir'];      
            return $upload;
        }
     }