check validate OpenCart - php

Question

I am trying to check on validate. in PrestaShop i do it this way:
if (empty($email)) {
$this->errors[] = Tools::displayError('Email is empty.');
$this->doLog('ERROR: Email/username is empty');
} elseif (!Validate::isEmail($email)) {
$this->errors[] = Tools::displayError('Invalid email address.');
$this->doLog('ERROR: Invalid Email address');
}
Does anyone have any idea how to do this in OpenCart?
Thanks

Answer 1

open this file for example:
catalog/controller/information/contact.php
you will see validate function:
protected function validate() {
if ((utf8_strlen($this->request->post['name']) < 3) || (utf8_strlen($this->request->post['name']) > 32)) {
$this->error['name'] = $this->language->get('error_name');
}
if (!filter_var($this->request->post['email'], FILTER_VALIDATE_EMAIL)) {
$this->error['email'] = $this->language->get('error_email');
}
if ((utf8_strlen($this->request->post['enquiry']) < 10) || (utf8_strlen($this->request->post['enquiry']) > 3000)) {
$this->error['enquiry'] = $this->language->get('error_enquiry');
}
// Captcha
if ($this->config->get($this->config->get('config_captcha') . '_status') && in_array('contact', (array)$this->config->get('config_captcha_page'))) {
$captcha = $this->load->controller('extension/captcha/' . $this->config->get('config_captcha') . '/validate');
if ($captcha) {
$this->error['captcha'] = $captcha;
}
}
return !$this->error;
}
In that file, you can also see how this function is used:
if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {