What is the use of $GLOBALS in PHP ?

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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"; 
  
?>