What is the recommended approach to validate a 2-digit number input from a form in PHP?

When validating a 2-digit number input from a form in PHP, the recommended approach is to use a combination of functions like `filter_var()` to ensure the input is numeric, and then check if the number falls within the desired range (10 to 99). This can be achieved by using conditional statements to validate the input and provide appropriate error messages if the input is invalid. 

$input = $_POST['number'];

if (filter_var($input, FILTER_VALIDATE_INT) && $input >= 10 && $input <= 99) {
    // Input is a valid 2-digit number
    echo "Valid input: " . $input;
} else {
    // Input is not a valid 2-digit number
    echo "Invalid input. Please enter a 2-digit number between 10 and 99.";
}

Keywords

form validation PHP input validation numeric validation error handling

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