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$x=10;
$y=20;
function test(){
global $x,$y; //使用global关键字
$y=$x+$y;
}
test();
echo $y;//输出30
这段代码怎么输入还是 20 呢？
When outputting, the result of the annotation is always the same - PHP Chinese website Q&A - When outputting, the result of the annotation is always the same - PHP Chinese website Q&A
Take a look around and learn.
考虑到php版本的兼容性问题，不建议这么写，推荐的写法如下：
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
When outputting, the result of the annotation is always the same - PHP Chinese website Q&A - When outputting, the result of the annotation is always the same - PHP Chinese website Q&A
Take a look around and learn.
考虑到php版本的兼容性问题，不建议这么写，推荐的写法如下：