Why is the result 0;
This output should be
echo $iphone6+$iphone6plus;
If you don’t add $, it will definitely be 0....
Why is the result 0;
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
This output should be
If you don’t add $, it will definitely be 0....