What are the potential pitfalls of using global variables in PHP programming?

Using global variables in PHP can lead to various issues such as making code harder to debug, maintain, and test. It can also lead to unexpected variable value changes due to the global scope. To avoid these pitfalls, it's recommended to minimize the use of global variables and instead use local variables within functions or pass variables as function parameters.

// Using local variables within functions instead of global variables
function myFunction() {
    $localVariable = "This is a local variable";
    
    // Use $localVariable within this function
}