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echo '在临时文件里写'.$numbytes.'字节';
改双引号，echo "在临时文件$numbytes字节写入";
为什么不打印出呢
Temporary file questions-PHP Chinese website Q&A-Temporary file questions-PHP Chinese website Q&A
Take a look around and learn.
你这样写的话，系统化会把“$numbytes字节写入”当做一个变量，肯定不显示了，如下图
如果真想这么输出的话，可以在$numbytes后面加上一个空格
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Temporary file questions-PHP Chinese website Q&A-Temporary file questions-PHP Chinese website Q&A
Take a look around and learn.
你这样写的话，系统化会把“$numbytes字节写入”当做一个变量，肯定不显示了，如下图
如果真想这么输出的话，可以在$numbytes后面加上一个空格