In what situations would it be beneficial to separate processing and output in PHP using variables instead of echoing directly?

Separating processing and output in PHP using variables instead of echoing directly can be beneficial when you need to manipulate the data before displaying it, or when you want to reuse the processed data in multiple places within your code. By storing the processed data in variables, you have more flexibility and control over how the output is generated.

// Processing data
$data = "Hello, World!";
$processedData = strtoupper($data);

// Output
echo $processedData;