What are the potential pitfalls of not separating input, output, and processing in PHP code?

The potential pitfalls of not separating input, output, and processing in PHP code include making the code harder to maintain, debug, and reuse. By separating these concerns, the code becomes more modular and easier to understand. One way to solve this issue is by following the principles of separation of concerns, where each part of the code (input, output, processing) is handled independently. 

// Input handling
$input = $_POST['data'];

// Processing
$processedData = processData($input);

// Output
echo $processedData;

function processData($data) {
    // Processing logic here
    return $data;
}

Keywords

input validation output escaping security vulnerabilities cross-site scripting code readability

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