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if (!$out = @fopen($uploadPath, "wb")) {
die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');
}
//windows环境能成功获取文件锁
//linux不能获取文件锁
if ( flock($out, LOCK_EX) )
{}