Introduction to the usage of php global keyword

The

global keyword is used to access global variables inside a function.

Sample code

<?php$x = 5;
$y = 10;

function myTest(){  
    global $x,$y;
    $x = $x+$y;
}

myTest();
echo $x; //15

php stores all global variables in a array named $GLOBALS[index]. index saves the name of the variable. This array can be For internal access within the function, you can also directlyupdateglobal variables;

The above example can be rewritten as follows:

<?php
$x = 5;
$y=10;

function myTest(){
    $GLOBALS[&#39;x&#39;] = $GLOBALS[&#39;x&#39;] + $GLOBALS[&#39;y&#39;];
}

myTest();
echo $x; //15

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