What is the use of $GLOBALS in PHP ?

In this article, we will discuss $GLOBALS in PHP. $GLOBALS is a superglobal variable used to access global variables from anywhere in the PHP program. PHP stores all global variables in an array called $GLOBALS[index]. 

Syntax:

$GLOBALS['index']=value;

• value is the input value.
• The index is the unique key for a particular value.

Example: PHP Program to demonstrates $GLOBALS.

PHP

<?php

// Initialize an index A
// and set to 100
$GLOBALS['A'] = 100;

// Display
echo $A;
echo "<br>";

// Initialize an index A
// and set to a string
$GLOBALS['B'] = "This is Global";

echo "\n";
echo $B;

?>

Output:

100
This is Global

Example 2: PHP program to perform arithmetic operations using $GLOBALS.

PHP

<?php

// Initialize an A index and set to 100
$GLOBALS['A'] = 100;

// Initialize an B index and set to 200
$GLOBALS['B'] = 200;

// Display addition
echo $GLOBALS['A']+$GLOBALS['B'];
echo "<br>";

// Display subtraction
echo $GLOBALS['A']-$GLOBALS['B'];
echo "<br>";

// Display multiplication
echo $GLOBALS['A']*$GLOBALS['B'];
echo "<br>";

// Display division
echo $GLOBALS['B']/$GLOBALS['A'];
echo "\n";

?>

Output:

 300
-100
 20000
 2