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The local test is indeed 15, you can try it locally
<?php
$x=5;
$y=10;
function mytest()
{
global $x,$y;
$y=$x+$y;
}
mytest();
echo $y;
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
The local test is indeed 15, you can try it locally
<?php
$x=5;
$y=10;
function mytest()
{
global $x,$y;
$y=$x+$y;
}
mytest();
echo $y;