valitron_issue_144.php

<?php
use Valitron\Validator;

$data = ['contact_number' => '', 'email_id' => ''];

//add data with the keys you want to check
$data['contact_info'] = [
    'contact_number', 'email_id'
];




Validator::addRule('contact_info_rule', function($field, $value, array $params, array $fields) {
    // check if at least one of the fields is not empty  
    foreach ($value as $field_id) {
        if (!empty($fields[$field_id])) {
            return true;
        }
    }
    return false;
}, 'One of contact_number, email_id is required');


$validator = new Validator($data);
$validator->rule('contact_info_rule', 'contact_info');


var_dump($validator->validate());