How to write custom validation rule in controller Laravel?

Question

I have default validation rule in controller Laravel:

$validator = Validator::make($request->all(), [
    'email' => 'required|email',
    'phone' => 'required|numeric',
    'code' => 'required|string|min:3|max:4',
    'timezone' => 'required|numeric',
    'country' => 'required|integer',
    'agreement' => 'accepted'
]);

I tried this, but dont know how to transfer some parameters inside function:

public function boot(){
    Validator::extend('phone_unique', function($attribute, $value, $parameters) {
        return substr($value, 0, 3) == '+44';
    });
}

How can I extent this validation by my own rule? For example I need to validate concatination of inputs:

$phone = $request->code.' '.$request->phone;

After check if $phone are exists in database

I want to use this method:

$validator->sometimes('phone', 'required|alpha_dash|max:25', function($input) {
    if ((Auth::user()->phone == $input->phone)) {
        return false;
    } else {
        $t = User::where("phone", $input->phone)->get();
        return ($t->count() > 0) ? false : false; 
    }
});

It does not work under all conditions (True, False) inside.

I added new validation nickname_unique:

$validator = Validator::make($request->all(), [
    'email' => 'required|email',
    'code' => 'required|string|min:3|max:4',
    'phone' => 'required|phone_unique',
    'timezone' => 'required|numeric',
    'country' => 'required|integer',
    'nickname' => 'required|alpha_dash|max:25',
    'agreement' => 'accepted'
], [
    'phone_unique' => 'Phone already exists!',
    'nickname_unique' => 'Nickname is busy!',
]);

It does not work, even not call validation rule below previos:

Validator::extend('nickname_unique', function ($attribute, $value, $parameters, $validator) {
    dd("Here");
});

Answer 1

You can define your custom validator inside AppServiceProvider like this:

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Facades\Validator;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Validator::extend('phone_unique', function ($attribute, $value, $parameters, $validator) {
          $inputs = $validator->getData();
          $code = $inputs['code'];
          $phone = $inputs['phone'];
          $concatenated_number = $code . ' ' . $phone;
          $except_id = (!empty($parameters)) ? head($parameters) : null;

          $query = User::where('phone', $concatenated_number);
          if(!empty($except_id)) {
            $query->where('id', '<>', $except);
          }

          return $query->exists();
      });

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

You can get all the inputs passed to the validator, by accessing $validator property - getData()

You can just add an extra parameter to your rules array after your custom validation rule (just after the colon) like this:

'phone' => 'required|phone_unique:1',

Pass the id to be ignored while checking entries into the db

The custom validator Closure receives four arguments: the name of the $attribute being validated, the $value of the attribute, an array of $parameters passed to the rule, and the Validator instance.

Now you can call the validator like this:

$validator = Validator::make($request->all(), [
      'email' => 'required|email',
      'code' => 'required|string|min:3|max:4',
      'phone' => 'required|phone_unique:1',
      'timezone' => 'required|numeric',
      'country' => 'required|integer',
      'agreement' => 'accepted'
  ], [
    'phone_unique' => 'Phone already exists!', // <---- pass a message for your custom validator
  ]);

See more about Custom Validation Rules.