How does the use of array_walk in the ValidValueDisplay class contribute to data validation and security in PHP?

The use of array_walk in the ValidValueDisplay class allows for iterating through an array of values and applying a validation function to each element. This helps in ensuring that all the data being displayed or processed meets certain criteria for validity, thus contributing to data validation and security in PHP by preventing potential vulnerabilities such as SQL injection or cross-site scripting attacks. 

class ValidValueDisplay {
    public function displayValues(array $values) {
        array_walk($values, function(&$value) {
            $value = $this->validateValue($value);
        });

        // Display the validated values
        foreach ($values as $value) {
            echo $value . "<br>";
        }
    }

    private function validateValue($value) {
        // Implement your validation logic here
        // For example, you can use htmlspecialchars to prevent XSS attacks
        return htmlspecialchars($value);
    }
}

// Example usage
$values = ["<script>alert('XSS attack');</script>", "valid value"];
$validator = new ValidValueDisplay();
$validator->displayValues($values);

Keywords

array_walk ValidValueDisplay class data validation security PHP

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