How can static variables in PHP functions help maintain variable values?

Static variables in PHP functions can help maintain variable values by retaining their value between function calls. This means that the variable's value is preserved even after the function has finished executing, allowing it to be accessed and updated across multiple calls to the function. This can be useful for keeping track of state or counting occurrences without the need for global variables.

function countCalls() {
    static $count = 0;
    $count++;
    echo "Function has been called $count times. <br>";
}

countCalls();
countCalls();
countCalls();