How can global variables be effectively used in PHP to pass data between functions?

Global variables can be effectively used in PHP to pass data between functions by declaring the variable outside of any function so that it is accessible throughout the script. This allows you to set the global variable in one function and access its value in another function without having to pass it as a parameter each time. 

<?php
// Declare a global variable outside of any function
$globalVar = "Hello, World!";

// Function to set the global variable
function setGlobalVar() {
    global $globalVar;
    $globalVar = "Goodbye, World!";
}

// Function to access the global variable
function getGlobalVar() {
    global $globalVar;
    echo $globalVar;
}

// Call the functions to demonstrate passing data using global variables
setGlobalVar();
getGlobalVar(); // Output: Goodbye, World!
?>

Keywords

global variables PHP data passing functions scope

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