The Validation class is a stand-alone library, which in terms means that it does not actually requires any other to function. The usage of this class is to validate data.

We are validating a string to with the Validation::is_alnum method, to ensure that the data only consist of alpha-numerical characters.

// Initiate main class
$Input = new Input;
 
$name = $Input->get ('name');
 
if ($Input->validate ('is_alnum', $name->value())) {
    // 'name' is now validated as an alpha-numerical string
}

This example shows how to validate data if you do not use the Input class.

// Initiate Validation class
$Validate = new Validate;
 
$data = 'abc1234%';
 
if ($Validate->is_alnum ($data) ) {
    echo 'Success!';
}  else {
    echo 'Failure!';
}

As you might see – it will return FALSE as $data contains a non-alpha-numerical character (%).