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$x=5;
$y=6;
function test(){
global $x,$y;
$y= $x $y;
}
test();
echo $y;
?>
After execution, the result is 6, shouldn’t it be 11? I checked that $x has no value
You only used the value of the global variable in the method, and the value of the global variable did not change.
Use the $GLOBAL super global function to print the data and you will know how much the data is
//是可以正常显示11呀，不行你复制本地测试一下看看 $x=5; $y=6; function test(){ global $x,$y; $y=$x+$y; //11= 5 + 6 } test(); echo $x; //5 echo ""; echo $y; //11
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
You only used the value of the global variable in the method, and the value of the global variable did not change.
Use the $GLOBAL super global function to print the data and you will know how much the data is
//是可以正常显示11呀，不行你复制本地测试一下看看 $x=5; $y=6; function test(){ global $x,$y; $y=$x+$y; //11= 5 + 6 } test(); echo $x; //5 echo ""; echo $y; //11