Validator - OOP

Question

I have a problem with the code and don't know what to do. I used this

$validate = new OOP_Validate;

$validate->addValidator(new OOP_Validate_Int());

if($validate->isValid('test')) echo 'TRUE';

and show me error:

Catchable fatal error: Argument 1 passed to OOP_Validate::addValidator() must implement interface OOP_Validate_Interface, instance of OOP_Validate_Int given, called in C:\xampp\htdocs\GameV\index.php on line 21 and defined in C:\xampp\htdocs\GameV\library\OOP\Validate.php on line 37

AddValidator:

public function addValidator(OOP_Validate_Interface $validator, $breakChain = false){
    $this->_validators[] = array(
        'Name'     =>  $validator,
        'Break'    =>  $breakChain,
    );
    return $this;   
}

Interface:

interface OOP_Validate_Interface {

    public function isValid($value);
    public function getMessage();

}

What could be wrong?

Answer 1

As the error message explains, the addValidator method requires that the first argument passed to it implements the interface called OOP_Validate_Interface .

$validate->addValidator(new OOP_Validate_Int() /* <-- this argument must implement OOP_Validate_Interface */);

Check your code and change the class declaration for OOP_Validate_Int to be:

class OOP_Validate_Int implements OOP_Validate_Interface
{

    /* 
       Then ensure that all the methods required by OOP_Validate_Interface
       are defined in this class.
    */

}

For more info, check the Object Interface section in the PHP manual.

Answer 2

The problem here is that method addValidator accepts the first parameter of type OOP_Validator_Interface but You pass it an instance of OPP_Validate_Int() here: $validate->addValidator(new OOP_Validate_Int()); .

I suggest not to explicitly retype the first argument of addValidator() (if it is not part of some framework) or in other hand a class OOP_Validate_Int must implement the OOP_Validator_Interface: class OOP_Validate_Int implements OOP_Validator_Interface { .. } .