Are there any potential pitfalls or drawbacks to using global variables in PHP functions?

Using global variables in PHP functions can lead to potential issues such as variable scope conflicts, difficulty in tracking variable changes, and decreased code readability. To avoid these pitfalls, it is recommended to pass variables as parameters to functions instead of relying on global variables.

// Avoid using global variables in functions
$globalVar = 10;

function exampleFunction($param) {
    // Use parameter instead of global variable
    $result = $param + 5;
    return $result;
}

// Call the function with the global variable as a parameter
$result = exampleFunction($globalVar);
echo $result; // Output: 15