Laravel: validate an integer field that needs to be greater than another

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There is no built-in validation that would let you compare field values like that in Laravel, so you’ll need to implement a custom validator, that will let you reuse validation where needed. Luckily, Laravel makes writing custom validator really easy.

Start with defining new validator in yor AppServiceProvider:

class AppServiceProvider extends ServiceProvider
{
  public function boot()
  {
    Validator::extend('greater_than_field', function($attribute, $value, $parameters, $validator) {
      $min_field = $parameters[0];
      $data = $validator->getData();
      $min_value = $data[$min_field];
      return $value > $min_value;
    });   

    Validator::replacer('greater_than_field', function($message, $attribute, $rule, $parameters) {
      return str_replace(':field', $parameters[0], $message);
    });
  }
}

Now you can use your brand new validation rule in your $rules:

$rules = [
  'initial_page' => 'required_with:end_page|integer|min:1|digits_between: 1,5',
  'end_page' => 'required_with:initial_page|integer|greater_than_field:initial_page|digits_between:1,5'
];

You’ll find more info about creating custom validators here: http://laravel.com/docs/5.1/validation#custom-validation-rules. They are easy to define and can then be used everywhere you validate your data.

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