How to use Interface to overcome multiple if, else - php

Question

NOTE: I have added only snippets of my code.
I have to validate Partner user while they register and if the validation passes then we create a plan for them else we treat them as a normal user and won't create a plan for them.
public function givePlan(Request $request){
/* Validation Code Goes Here */
try{
$data = $request->all();
/*Get partner details*/
$partner = $this->getPartnerDetailsByUniqueId($data['partner_id']);
/** Validate the user details */
$this->validateUser($partner, $data['phone']);
/* Rest of the code */
}catch(\Exception $e){
/* 400 handle the exception */
}
}
protected function validateUser($partner, $phone){
$partnerObj = new ValidatePartner();
if($partner == 'partner1'){
$partnerObj->validatePartner1($phone);
/* rest of the code */
}else if($partner == 'partner2'){
$partnerObj->validatePartner2($phone);
/* rest of the code */
}else if($partner == 'partner3'){
$partnerObj->validatePartner3($phone);
/* rest of the code */
}
}
The problem over here is we need to check the partner with multiple if else condition and then validate the user.
I know we can use the Polymorphism with this and can be achieved by Interface as follows
interface ValidateUser {
public function validate();
}
class Partner1 implements ValidateUser{
public function validate(){
}
}
But again I need to check and create the partner object and the following code still exists
$partnerObj = new Partner1();
$partnerObj->validate($phone);
I had read somewhere that we can pass directly the interface object to achieve this without the object knowledge. Can anyone help me out with this issue?
Any other programming language implementation with Interface or similar feature of PHP is welcome.

Answer 1

Implementing interface having simple function validate.
class partnerFactory {
public static function getType($type) {
switch ($type) {
case 'partner1':
return new Partner1();
case 'partner2':
return new Partner1();
default:
break;
}
}
}
class Partner1 implements ValidateUser {
public function validate() {
// your function here.
}
}
interface ValidateUser {
public function validate() { }
}
$partner1 = partnerFactory::getType('partner1');
$partner1->validate();
$partner2 = partnerFactory::getType('partner2');
$partner2->validate();