Laravel validation rule for one item which can be email or phone number

 

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My proposition is to write custom validation rule, where you will be conditionally check if it is a valid email or phone number.

Validator::extend('email_or_phone', function ($attribute, $value, $parameters, $validator) {
   return 
       $validator->validateDigitsBetween($attribute, $value, [8, 10]) ||
       $validator->validateEmail($attribute, $value, []);
});

Write this code in boot method in for example AppServiceProvider. I also strongly recommend you to use dedicated classes for custom rules as described here: https://laravel.com/docs/9.x/validation#custom-validation-rules

In both ways you just end up with code like this:

public function rules()
{
    return [
        'credentials' => ['email_or_phone'], // HERE WE USE OUR CUSTOM RULE
        'g-recaptcha-response' => ['required'],        
    ];
}