[Laravel] Custom Validation rule for day of week.

validateDay.php

<?php

Validator::extend('day', function($attribute, $value, $parameters, $validator) {

    // Laravel uses Carbon. Just `use Carbon\Carbon;` it
    $day = Carbon::parse($value)->dayOfWeek;

    switch (strtolower($parameters[0])) {
        case 'sunday':
            return $day == 0;
        case 'monday':
            return $day == 1;
        case 'tuesday':
            return $day == 2;
        case 'wednesday':
            return $day == 3;
        case 'thursday':
            return $day == 4;
        case 'friday':
            return $day == 5;
        case 'saturday':
            return $day == 6;
        default:
            return false;
    }

});

Validator::replacer('day', function($message, $attribute, $rule, $parameters){
    return str_replace(':day', $parameters[0], $message);
});

/*
* Sample error message
* 'registration_date.day' => ':attribute must fall on :day'
*/

?>