非PHP程序员照着源码打的小布丁…
SAE是不允许本地磁盘读写的，所以使用wordpress撰写文章的时候, 上传控件默认是用不了的,
幸好SAE提供了storage服务来存储文件，那就可以修改wordpress上传文件的实现，把文件存储到sae storage就可以了。
首先需要在SAE中开启storage服务，并创建一个 domain ,命名随意(后面会用到), 可看做是一个命名空间，或者是根目录。
然后修改wordpress的源码文件: wp-admin/includes/file.php ,
找到 wp_handle_upload函数，将原本上传部分的代码注释掉, 并添加几行代码来将文件上传到SAE Storage:
319 /* 注释部分开始
320 // A writable uploads dir will pass this test. Again, there's no point overriding this one.
321 if ( ! ( ( $uploads = wp_upload_dir($time) ) && false === $uploads['error'] ) )
322 return call_user_func($upload_error_handler, $file, $uploads['error'] );
323
324 $filename = wp_unique_filename( $uploads['path'], $file['name'], $unique_filename_callback );
325
326 // Move the file to the uploads dir
327 $new_file = $uploads['path'] . "/$filename";
328 if ( false === @ move_uploaded_file( $file['tmp_name'], $new_file ) )
329 return $upload_error_handler( $file, sprintf( __('The uploaded file could not be moved to %s.' ), $uploads['path'] ) );
330
331 // Set correct file permissions
332 $stat = stat( dirname( $new_file ));
333 $perms = $stat['mode'] & 0000666;
334 @ chmod( $new_file, $perms );
335
336 // Compute the URL
337 $url = $uploads['url'] . "/$filename";
338 注释部分结束*/
339
340 //新增部分开始 upload file to SAE Storage
341 $fname = wp_unique_filename('', $file['name'], $unique_filename_callback);
342 $fname = "wordpress/" . date('Ymd') . "/" . $fname;
343 $stor = new SaeStorage();
344 $storRet = $stor->upload('codegallery',$fname, $file['tmp_name']);
345
346 if(!$storRet) {
347 return $upload_error_handler( $file, sprintf( __('The uploaded file could not be moved to SAE STORAGE.' ) ) );
348 }
349 $url = $storRet;
350 $new_file = $url;
//新增部分结束
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注意其中
$storRet = $stor->upload('codegallery',$fname, $file['tmp_name']);
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是调用SAE Storage的API,
‘codegallery’ 就是之前我们创建的storage domain的名字, 需要根据实际情况修改.
$fname 是写入storage的文件名, 可以根据你想要的规则来修改, 我这里在原来的基础上, 把文件放到了 “wordpress/年月日” 命名的文件夹下.
就这么多, 将file.php更新到SAE版本库就可以了 
看一下效果:
可以正常的上传了；不过遗憾的是，图片的缩略图按钮点了没反应，由于我PHP完全是个小白，就忍了吧……