前端功能图片上传不起作用

已尝试此代码，但不起作用：

if (!function_exists(\'wp_generate_attachment_metadata\')){
            require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
            require_once(ABSPATH . "wp-admin" . \'/includes/file.php\');
            require_once(ABSPATH . "wp-admin" . \'/includes/media.php\');
        }
         if ($_FILES) {
            foreach ($_FILES as $file => $array) {
                if ($_FILES[$file][\'error\'] !== UPLOAD_ERR_OK) {
                    return "upload error : " . $_FILES[$file][\'error\'];
                }
                $attach_id = media_handle_upload( $file, $post_id );
            }   
        }
        // Define attachment metadata
       $attach_data = wp_generate_attachment_metadata( $attach_id, $file );
       // Assign metadata to attachment
       wp_update_attachment_metadata( $attach_id, $attach_data );
        if ($attach_id > 0){
            //and if you want to set that image as Post  then use:
            set_post_meta($post_id,\'_thumbnail_id\',$attach_id);
        }

<?php // Upload image to wordpress media and save image url to custom field. if(isset($_FILES[\'images\'])) { // These files need to be included as dependencies when on the front end. require_once( ABSPATH . \'wp-admin/includes/image.php\' ); require_once( ABSPATH . \'wp-admin/includes/file.php\' ); require_once( ABSPATH . \'wp-admin/includes/media.php\' ); require_once( ABSPATH . \'wp-admin/includes/admin.php\' ); $file_return = wp_handle_upload( $_FILES[\'images\'], array(\'test_form\' => false ) ); if( isset( $file_return[\'error\'] ) || isset( $file_return[\'upload_error_handler\'] ) ) { echo $file_return[\'error\']; } else { $attachment = array( \'post_mime_type\' => $file_return[\'type\'], \'post_title\' => preg_replace( \'/\\.[^.]+$/\', \'\', basename( $file_return[\'file\'] ) ), \'post_content\' => \'\', \'post_status\' => \'inherit\', \'guid\' => $file_return[\'url\'], \'post_parent\' => $post_id, ); // Insert attachment $attachment_id = wp_insert_attachment( $attachment, date(\'Y/m/\') . basename($file_return[\'url\']) ); // Set post thumbnail if( !has_post_thumbnail($post_id) ) { set_post_thumbnail($post_id, $attachment_id); } // Update post meta if( $attachment_id ) { $file_location = get_bloginfo(\'url\') . \'/app/uploads/\' . date(\'Y/m/\') . basename($file_return[\'url\']); update_post_meta($attachment_id, \'_wp_attachment_metadata\', serialize(array($file_location))); } } }

functions php file

好的，我正在编辑我的函数。Wordpress中的php文件（关于我的子主题），我删除了一行代码（在删除之前我复制了代码）。这导致了白色的死亡屏幕，所以我简单地粘贴回我删除的代码（是的，我将它粘贴回我删除它的位置），但我仍然有白色的死亡屏幕。我已经完成了这些功能。我上周完成的一个备份中的php文件（功能齐全），并通过FTP将其上载到正确的文件夹，但没有任何效果。我已经尝试再次激活父主题，并创建了另一个子主题，以便比较这两个功能。php文件（将全新的、有效的子主题与不再工作的原始子主题进行比较），代码看起来是

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functions php file