Valitron\Validator::validate PHP Method

    public function validate()
    {
        foreach ($this->_validations as $v) {
            foreach ($v['fields'] as $field) {
                list($values, $multiple) = $this->getPart($this->_fields, explode('.', $field));
                // Don't validate if the field is not required and the value is empty
                if ($this->hasRule('optional', $field) && isset($values)) {
                    //Continue with execution below if statement
                } elseif ($v['rule'] !== 'required' && !$this->hasRule('required', $field) && (!isset($values) || $values === '' || $multiple && count($values) == 0)) {
                    continue;
                }
                // Callback is user-specified or assumed method on class
                $errors = $this->getRules();
                if (isset($errors[$v['rule']])) {
                    $callback = $errors[$v['rule']];
                } else {
                    $callback = array($this, 'validate' . ucfirst($v['rule']));
                }
                if (!$multiple) {
                    $values = array($values);
                }
                $result = true;
                foreach ($values as $value) {
                    $result = $result && call_user_func($callback, $field, $value, $v['params'], $this->_fields);
                }
                if (!$result) {
                    $this->error($field, $v['message'], $v['params']);
                }
            }
        }
        return count($this->errors()) === 0;
    }

 /**
  * Fix bug where rules messages added with Validator::addRule were replaced after creating validator instance
  */
 public function testRuleMessagesReplacedAfterConstructor()
 {
     $customMessage = 'custom message';
     $ruleName = 'customRule';
     $fieldName = 'fieldName';
     Validator::addRule($ruleName, function () {
     }, $customMessage);
     $v = new Validator(array($fieldName => $fieldName));
     $v->rule($ruleName, $fieldName);
     $v->validate();
     $messages = $v->errors();
     $this->assertArrayHasKey($fieldName, $messages);
     $this->assertEquals(ucfirst("{$fieldName} {$customMessage}"), $messages[$fieldName][0]);
 }