wordpress文件上传到服务器改变文件名

add_filter( 'wp_handle_upload_prefilter', 'modify_uploaded_file_names', 20);

function modify_uploaded_file_names( $image ) {
// Get default name of uploaded file and set to variable
$imagename = $image['name'];
// Case switch for multiple file extensions
switch ( $image['type'] ) {
case 'image/jpeg' :
$suffix = 'jpg';
break;
case 'image/png' :
$suffix = 'png';
break;
case 'image/gif' :
$suffix = 'gif';
break;
}
// Get size of uploaded image and assign to variable
$imagesize = getimagesize($image);
// Re-structure uploaded image name
$image['name'] = "{$imagesize[0]}x{$imagesize[1]}-{$imagename}.{$suffix}";

return $image;
}

// Move the file to the uploads dir
$new_file = $uploads['path'] . "/".date("YmdHis").floor(microtime()*1000).".".$ext;
if ( false === @ move_uploaded_file( $file['tmp_name'], $new_file ) )
return $upload_error_handler( $file, sprintf( __('The uploaded file could not be moved to %s.' ), $uploads['path'] ) );