How can I ensure compatibility with different PHP versions when using global variables?

When using global variables in PHP, it's important to be mindful of compatibility with different PHP versions. To ensure compatibility, you can use the global keyword before accessing a global variable within a function. This helps prevent any issues that may arise due to changes in PHP versions. 

// Define a global variable
$globalVar = 'Hello, world!';

// Access the global variable within a function using the global keyword
function printGlobalVar() {
    global $globalVar;
    echo $globalVar;
}

// Call the function to print the global variable
printGlobalVar();

Keywords

global variables PHP versions compatibility backward compatibility variable scope

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