下面以wordpress 3.2.1为例，打开wp-admin/includes/file.php文件，找到第326行这段代码：
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// Move the file to the uploads dir
$new_file = $uploads['path'] . "/$filename";
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'] ) );
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将其修改为
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// Move the file to the uploads dir
$new_file = $uploads['path'] . "/".date_i18n("YmdHis").floor(microtime()*1000).".".$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.' ), $uploads['path'] ) );
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保存，重新上传文件。这样，新上传的文件，就会自动保存为“年月日时分秒+千位毫秒整数”的新文件名，并保存到相应的年月文件夹之下
还有一种办法
把以下代码添加到主题目录functions.php 文件 里面 判断如果是中文就自动改成md5的储存名
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function upload_file($filename) {
$parts = explode('.', $filename);
$filename = array_shift($parts);
$extension = array_pop($parts);
foreach ( (array) $parts as $part)
$filename .= '.' . $part;
if(preg_match('/[一-?]/u', $filename)){
$filename = md5($filename);
}
$filename .= '.' . $extension;
return $filename ;
}
add_filter('sanitize_file_name', 'upload_file', 5,1);
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