How can PHP whitelist be implemented to ensure secure data handling based on user input?

To ensure secure data handling based on user input, a PHP whitelist can be implemented by defining an array of allowed values and validating user input against this whitelist. This approach helps prevent malicious input or unexpected data from being processed by the application, thereby enhancing security. 

// Define a whitelist of allowed values
$allowed_values = array("option1", "option2", "option3");

// Validate user input against the whitelist
$user_input = $_POST['input_field'];

if (in_array($user_input, $allowed_values)) {
    // Process the input
    echo "Input is valid";
} else {
    // Handle invalid input
    echo "Invalid input";
}

Keywords

PHP whitelist secure data handling user input implementation

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