How can global variables be properly defined and used in PHP to ensure correct variable passing between pages?

Global variables in PHP can be defined using the `global` keyword within functions to access variables defined outside the function's scope. To ensure correct variable passing between pages, it's important to define global variables at the beginning of each page where they are needed. This way, the variables are accessible throughout the entire script. 

<?php
// Define global variable
global $globalVar;
$globalVar = "Hello, world!";

// Function to use global variable
function useGlobalVar() {
    global $globalVar;
    echo $globalVar;
}

// Call function to use global variable
useGlobalVar();
?>

Keywords

global variables PHP variable passing scope include statement

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