What are some common strategies for managing data flow between functions in PHP?

One common strategy for managing data flow between functions in PHP is to use function parameters to pass data from one function to another. Another approach is to use global variables to share data between functions. Additionally, you can use return values to pass data back from a function to its caller.

// Using function parameters to pass data between functions
function getData() {
    return "Hello";
}

function processData($data) {
    return $data . " World";
}

$data = getData();
$result = processData($data);
echo $result; // Output: Hello World