How can the use of global variables and $GLOBALS be optimized in PHP code to improve readability and maintainability?

Using global variables and $GLOBALS in PHP code can lead to code that is hard to read and maintain. To optimize their use, it's recommended to minimize the use of global variables and instead pass variables as function parameters. This approach helps improve code readability and makes it easier to track the flow of data within the code.

// Avoid using global variables and $GLOBALS
$globalVar = 10;

function myFunction() {
    global $globalVar;
    echo $globalVar;
}

myFunction();

// Optimize by passing variables as function parameters
$globalVar = 10;

function myFunction($var) {
    echo $var;
}

myFunction($globalVar);