What are some best practices for restricting user registration based on specific criteria like a fixed range of postal codes in PHP?

To restrict user registration based on specific criteria like a fixed range of postal codes in PHP, you can validate the postal code input against the allowed range before allowing the user to register. This can be done by checking if the entered postal code falls within the specified range. If it does not, display an error message to the user and prevent registration. 

// Define the allowed range of postal codes
$allowedPostalCodes = range(1000, 2000);

// Get the user input postal code
$userPostalCode = $_POST['postal_code'];

// Validate if the user postal code is within the allowed range
if (!in_array($userPostalCode, $allowedPostalCodes)) {
    // Postal code is not within the allowed range, display an error message
    echo "Postal code is not within the allowed range. Please try again.";
} else {
    // Postal code is within the allowed range, proceed with user registration
    // Your registration logic here
}

Keywords

PHP user registration postal codes validation restriction

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