custom validator in laravel to validate comma separated emails.

custom validator in laravel to validate comma separated emails.php

<?php
// custom validator in laravel to validate comma separated emails. 

\Validator::extend("emails", function($attribute, $values, $parameters) {
            $value = explode(',', $values);
            $rules = [
                'email' => 'required|email',
            ];
            if ($value) {
                foreach ($value as $email) {
                    $data = [
                        'email' => $email
                    ];
                    $validator = \Validator::make($data, $rules);
                    if ($validator->fails()) {
                        return false;
                    }
                }
                return true;
            }
        });
        
        
// Custom message for that validation 
// pass this array as third parameter in \Validator::make
  array('emails' => ':attribute must have valid email addresses.');
  
  
// Usage: 
 $rules['notifications'] = 'emails'; // 'emails' is name of new rule. 

<?php

namespace App\Rules\Emails;

use Illuminate\Contracts\Validation\Rule;
use Illuminate\Support\Facades\Validator;

class CommaSeparatedEmails implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return !Validator::make(
            [
                "{$attribute}" => explode(',', $value)
            ],
            [
                "{$attribute}.*" => 'required|email'
            ]
        )->fails();
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The :attribute must have valid email addresses.';
    }
}

Usage:

use App\Rules\Emails\CommaSeparatedEmails;

$request->validate([
      'daily_reports' => ['nullable', new CommaSeparatedEmails],
      'weekly_reports' => ['nullable', new CommaSeparatedEmails],
]);

If there's a space after a comma the validation fails, so we should trim the email addresses:

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;
use Illuminate\Support\Facades\Validator;

class CommaSeparatedEmails implements Rule
{
    /**
     * Determine if the validation rule passes.
     *
     * @param string $attribute
     * @param mixed  $value
     *
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return ! Validator::make(
            [
                "{$attribute}" => array_map('trim', explode(',', $value)),
            ],
            [
                "{$attribute}.*" => 'email',
            ]
        )->fails();
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The :attribute must have valid email addresses.';
    }
} 

Very nice - set up a custom validator to first transform the data from a string to an array, then apply a validation rule to every element of the array.

I have to sat it out loud, then it makes it easier to find next time I need this :-)