In the example of the PHP global keyword, the output is not equal to 15 but is actually equal to 10

Question

The code is as follows <?php $x=5; $y=10; function myTest() { global $x,$y; $y=$x+$y; } myTest(); echo $y; // Output 15 ?>

ringa_lee · Answer

The answer is 10, that’s right. First of all, you have to understand the definition of the keyword global. There is a big difference between global and $GLOBALS. $GLOBALS defines variables as global variables. If it is defined by $GLOBALS, the result will be natural. It is 15, and global is used as a reference. Please note that the reference is not a pointer, and it cannot ultimately change the result of $x or $y!

范珺 · Answer

It seems to be 15