Why $GLOBALS['y'] is 10

Question

<?php
$x=10;
$y=20;
function test(){
global $x,$y; //Use global keyword

$y=$x $y;
}
test();
echo $y;

##<? php

$x=5;

$y=10;

function myTest()

{

$GLOBALS['y']=$GLOBALS['x'] $GLOBALS['y'];

}

myTest();

echo $y;

?>

Are these two writing methods the same? Why is the returned result one 30 global $y

Answer 1

Only the first $y is a global variable